All 375 Free Online Tools
Every tool on OnlineToolHubs in one place, grouped across 13 categories. Each one runs in your browser — no account, no install, no upload of your data.
Showing 375 of 375 tools
Calculators (72)
- BMI CalculatorWork out your BMI, and the measurement current NICE guidance asks for alongside it: waist-to-height ratio, which…
- Age CalculatorYour exact age in years, months and days plus every other unit, the weekday you were born, your next birthday, and…
- Date CalculatorFind the days, weeks, weekdays and exact years/months/days between two dates, or add or subtract days, weeks…
- Percentage CalculatorA percentage calculator with the working shown: percent of a number, percent change, percent difference, reverse…
- Tip CalculatorA tip calculator that works on the pre-tax or post-tax amount and shows what the choice costs, splits any number…
- Unit ConverterA unit converter across 12 categories and 90+ units that shows the factor used — and whether it is exact by…
- Frequency Unit ConverterA frequency converter across Hz, kHz, MHz, GHz, RPM and angular frequency, plus the period — all from one value…
- Standard Deviation & Variance CalculatorA standard deviation calculator for sample and population, with the full working, relative standard deviation, and…
- Standard Normal Z-Score & Percentile CalculatorA z score calculator both ways — score to percentile and back — with the step most skip: for a sample mean the…
- Scientific & Engineering Notation ConverterA scientific notation converter for decimal, E-notation and engineering form without losing digits — and a warning…
- Quadratic Equation Formula SolverA quadratic equation solver for ax² + bx + c = 0: the discriminant step by step, real or complex roots, and the…
- Right Triangle Trigonometry & Pythagorean CalculatorA right triangle trig calculator solving from any two values: sides, angles, area, altitude, inradius and…
- Circle Area, Circumference & Diameter CalculatorSolve a circle from radius, diameter, circumference or area — plus arc length, sector, chord and segment, which…
- Fraction Arithmetic & Simplifier CalculatorAdd, subtract, multiply and divide fractions — including mixed numbers and a third fraction, which the top-ranking…
- Significant Figures Counter & Rounding CalculatorCount significant figures and round correctly — including the ambiguous cases like 100 and 1000, and the…
- Matrix Determinant Calculator (2×2 to 5×5)Determinants for 2×2, 3×3, 4×4 and 5×5 matrices with the cofactor expansion shown — exact for integer inputs, so a…
- Logarithm & Natural Log (ln) CalculatorSolve for any part of log₆(x) = y — the logarithm, the antilog or the base — with the change-of-base working…
- Prime Number Tester & Factorization GeneratorPrime factors, divisor count and primality — plus the square root in simplest radical form, which no other…
- Permutations (nPr) & Combinations (nCr) CalculatornPr and nCr with and without repetition — all four cases, in exact arbitrary precision, where most calculators…
- Recipe Portion & Serving Size ScalerScale recipe ingredient quantities up or down automatically by serving size or party count.
- Baking Yeast Ratio Converter (Instant, Active & Fresh)Convert between Instant Dry Yeast (IDY), Active Dry Yeast (ADY), and Fresh Compressed Cake Yeast with precision…
- Specialty Coffee Brew Ratio CalculatorCalculate golden coffee-to-water brewing ratios (1:15 to 1:18) for Pour Over (V60/Chemex), French Press…
- Meat & Poultry Roasting Temperature TimerCalculate oven roasting times, temperatures, and USDA-recommended internal meat thermometer temperatures for Beef…
- Sourdough Hydration & Baker’s Percentage CalculatorCalculate artisan sourdough dough hydration percentages, main flour, water, 100% hydration starter/levain, and…
- Boiled Egg Cooking Timer (Soft, Jammy & Hard)Exact boiling times for soft, jammy and hard-boiled eggs. Adjusts for egg size, fridge-cold or room-temperature…
- Airline Luggage Weight (KG to LBS) & Dimension ConverterConvert luggage weights between kilograms (kg) and pounds (lbs). Checks standard airline baggage allowances (23kg…
- Camera Sensor Crop Factor & Focal Length EquivalentCalculate 35mm full-frame equivalent focal length (mm), field of view classification, and equivalent depth of…
- Photography Exposure Value (EV) & Lux CalculatorCalculate photography Exposure Value (EV100), ambient scene illuminance in Lux, and aperture/shutter/ISO exposure…
- Golden Hour & Blue Hour Photography Lighting CalculatorCalculate morning and evening Golden Hour and Blue Hour natural light windows from local sunrise and sunset times…
- Mean, Median, Mode & Range CalculatorEnter any list of numbers to get the mean, median, mode and range — including honest multimodal and no-mode…
- Weighted Average CalculatorCalculate a weighted average from any list of values and weights — raw counts or percentages — plus a reverse…
- GCF & LCM CalculatorFind the greatest common factor and least common multiple of 2 or more numbers, with the full Euclidean algorithm…
- Mulch CalculatorA mulch calculator for rectangle, circle, or triangle beds that converts area and depth into cubic yards, cubic…
- Cooking Measurement ConverterA cooking measurement converter that accounts for ingredient density, using King Arthur Baking's weight chart, so…
- Button Size CalculatorA sewing button size calculator that converts between ligne (L), millimeters, and inches, with typical garment use…
- Roofing CalculatorA roofing calculator that converts building footprint and roof pitch into true roof area, squares, shingle…
- Leap Year CalculatorA leap year calculator that checks any year against the Gregorian calendar rule and lists every leap year in a…
- Random Number GeneratorPick random numbers in any range: one or thousands at once, with or without repeats, sorted or in draw order.
- Scientific CalculatorA free scientific calculator with sin, cos, tan, logs, roots, powers, factorials and degree/radian modes.
- Concrete CalculatorWork out how much concrete you need for a slab, footing, post hole, column or stairs — in cubic yards, cubic feet…
- Square Footage CalculatorAdd up the square footage of rooms and odd shapes — rectangles, circles, triangles, trapezoids — subtract…
- Long Division CalculatorDivide any two numbers and see the full written long division, step by step — with remainders, decimal answers…
- Slope CalculatorFind the slope of a line from two points or rise and run: slope as a fraction, angle, percent grade, ratio, y = mx…
- Time CalculatorAdd or subtract hours, minutes and seconds, add time to a clock time, or find the time between two times — with…
- Dog Age CalculatorConvert your dog’s age to human years with the 2020 epigenetic-clock formula and the veterinary rule of thumb…
- Square Root CalculatorFind the square root, cube root or any nth root of a number, simplify radicals like √72 = 6√2, handle negatives…
- Decimal to Fraction CalculatorConvert any decimal to a fraction in simplest form with steps — including repeating decimals, mixed numbers and…
- Tire Size CalculatorEnter a tire size like 225/45R17 for diameter, sidewall and revs per mile, then compare a new size to see…
- Area CalculatorFind the area of a rectangle, triangle, circle, trapezoid, ellipse, sector, polygon and more, with the formula…
- Gravel CalculatorWork out how much gravel or crushed stone you need in cubic yards and tons, plus bags and cost, for a rectangle…
- Cubic Yard CalculatorCalculate cubic yards for soil, mulch, gravel or fill. Add several rectangles, circles or triangles with their own…
- Golf Handicap CalculatorEstimate your World Handicap System Handicap Index from recent scores, course rating and slope, then get your…
- BTU CalculatorFind the right air conditioner size in BTU for any room from its square feet, sun exposure, people and kitchen…
- Paint CalculatorWork out how many gallons of paint you need for a room: walls minus doors and windows, number of coats, ceiling…
- Sample Size CalculatorFind the sample size you need for a survey from confidence level, margin of error and population, or the margin of…
- Electricity Cost CalculatorFind how much your appliances cost to run per day, month and year. Add devices by watts and hours, use your own…
- Cat Age CalculatorConvert your cat’s age to human years with the veterinary chart (15, then 24, then +4 a year) and see its life…
- Exponent CalculatorRaise any number to any power: exact results for whole-number exponents (2^100 in full), negative exponents as…
- Rounding CalculatorRound numbers to decimal places, the nearest 0.25, 5, 10 or 100, or significant figures — half up, banker’s…
- Ratio CalculatorSimplify ratios like 12:18 to 2:3 (decimals and three-part ratios too), solve A:B = C:D for the missing value, or…
- Midpoint CalculatorFind the midpoint of two points in 2D or 3D, a missing endpoint, or the point dividing a segment in a ratio — with…
- Volume CalculatorVolume of a cube, box, cylinder, cone, sphere, pyramid, prism, capsule, tube and more, with the formula shown and…
- Probability CalculatorProbability of A and B, A or B, neither, at least once in n tries, or exactly k successes in n trials.
- Watts to Amps CalculatorConvert watts to amps and amps to watts for DC, AC single-phase and three-phase circuits, with power factor, kVA…
- Voltage Drop CalculatorVoltage drop for copper or aluminum wire by AWG or kcmil, current and length — single phase, three phase or DC…
- Stair CalculatorPlan stairs from the total rise: number of risers and treads, riser height, total run, stringer length and angle…
- P-Value CalculatorFind the p-value from a z, t, chi-square or F statistic, or a correlation r — one- or two-tailed, with critical…
- Confidence Interval CalculatorConfidence intervals for a mean (t or z, from summary stats or raw data) or a proportion (Wilson, Wald, exact)…
- Triangle CalculatorSolve any triangle from three values — SSS, SAS, ASA, AAS or the ambiguous SSA case — with angles, area…
- Board Foot CalculatorCalculate board feet for one board or a whole lumber list, with 4/4–16/4 thicknesses, price per board foot, a…
- Pool Volume CalculatorHow many gallons is your pool? Rectangle, round, oval or kidney, flat or sloped floor, in feet or meters — plus…
- Tile CalculatorTiles and boxes for a floor or wall: several areas with cut-outs, any tile size and grout joint, waste by layout…
Currency & Finance (57)
- Mortgage CalculatorA mortgage calculator with full PITI, the exact month PMI ends under federal law, the crossover month, and what…
- Currency ConverterA currency converter for 166 currencies at the mid-market rate, plus what a card, bank or bureau actually gives…
- Compound Interest CalculatorA compound interest calculator with contributions on their own schedule, the effective annual rate, a…
- Loan Payoff CalculatorSee how extra payments cut your loan short. Get payoff date, total interest saved, and the full month-by-month…
- Salary & Tax CalculatorA salary tax calculator using 2026 IRS brackets and the $184,500 Social Security cap.
- Crypto Profit CalculatorCalculate cryptocurrency investment returns, net profit/loss, and exchange fees with live prices for Bitcoin…
- Auto Loan CalculatorEstimate your car payment with tax and trade-in, then see how long each term leaves you underwater.
- Retirement & 401(k) CalculatorA retirement calculator that projects your nest egg with the 4% rule — plus what a single-average projection…
- Credit Card Payoff CalculatorCalculate how long to pay off your credit card balance, total interest costs, minimum payments, and interest saved…
- Simple Interest CalculatorA simple interest calculator showing the 365- and 360-day conventions side by side — the difference lenders rely…
- Inflation & Purchasing Power CalculatorAn inflation calculator running on the official BLS CPI-U series, the same data the government calculator uses…
- Net Worth CalculatorA net worth calculator that benchmarks your total against the Federal Reserve median for your age band — not the…
- Certificate of Deposit (CD) CalculatorCalculate certificate of deposit maturity earnings, APY compounding interest (daily, monthly, annually), and total…
- Hourly to Salary ConverterAn hourly to salary calculator with FLSA overtime, paid versus unpaid leave side by side, and what FICA takes…
- Down Payment Savings CalculatorA down payment calculator for the cash you actually need — down payment plus closing costs — whether PMI applies…
- Stock & Crypto Average Down CalculatorA stock average calculator for your average entry price across every buy lot — the price a holding must reach to…
- Future Value (FV) CalculatorA future value calculator for a lump sum plus recurring monthly contributions, showing how much of the result each…
- Capital Gains Tax CalculatorA capital gains tax calculator for stocks and for a house sale: 2026 IRS brackets, the $250k/$500k home exclusion…
- Cash-on-Cash Return CalculatorA cash-on-cash return calculator for rental property: annual pre-tax cash flow divided by actual cash invested…
- Cryptocurrency Market Cap & Price TrackerTrack real-time cryptocurrency prices, 24-hour trading volumes, price percentage changes, and total market…
- Ethereum Gas Fee & Gwei TrackerEstimate real-time Ethereum network gas fees in Gwei and USD for ETH transfers, ERC-20 token sends, Uniswap swaps…
- Gold & Silver Bullion Karat Price CalculatorCalculate the spot melt value of gold and silver bullion, coins, and jewelry across 24k, 22k, 18k, 14k, and 10k…
- Bitcoin Halving Countdown & Reward ScheduleTrack the exact countdown to the next Bitcoin Halving event, remaining block height, historical mining rewards…
- Total Compensation (TC) & Salary CalculatorCalculate and negotiate your true total compensation (TC) package including base salary, annual bonus, stock…
- Rule of 72 Compound Interest CalculatorA Rule of 72 calculator for how long money takes to double at a given rate — and where the shortcut is accurate…
- Rent vs Buy Real Estate CalculatorFind the year buying beats renting, counting selling costs and the investment return you give up on the down…
- Cost of Living Index & Salary Parity CalculatorCompare cost of living differences between major world cities (New York, San Francisco, Austin, London, Berlin…
- Crypto Staking APY & Compounding CalculatorCalculate crypto staking rewards, daily compounding returns, and monthly passive income in tokens and USD across…
- Fixed Annuity Monthly Payout CalculatorMonthly and annual income from a lump sum over a fixed term — plus real life-annuity quotes at 65 and the return…
- Emergency Fund & Safety Net CalculatorAn emergency fund calculator sized from essential expenses — 3, 6, 9 or 12 months by income stability — and how…
- Auto Lease vs Buy & Cost of Ownership CalculatorA car lease vs buy calculator comparing the true cost of each: monthly payments, money down, interest, and the…
- Stock Dividend Yield & DRIP CalculatorA dividend yield calculator with annual income, DRIP compounding and yield on cost — plus why a rising yield is…
- Stock Options Profit & Breakeven SimulatorCalculate net profit, loss, breakeven stock prices, and return on capital for Long Call and Long Put stock options…
- Home Equity & HELOC Borrowing CalculatorA home equity loan calculator for borrowing capacity and the exact monthly payment, including HELOC draw-period…
- Loan & Mortgage Amortization ScheduleA loan amortization schedule generator producing every payment row, not a summary.
- Net Effective Rent & Concession CalculatorA net effective rent calculator for the real monthly cost of a lease once free months, concessions and upfront…
- Commercial Real Estate Cap Rate CalculatorCalculate commercial real estate Capitalization Rate (Cap Rate), Net Operating Income (NOI), and Gross Rent…
- Vacation & Travel Daily Budget PlannerEstimate total vacation and travel trip expenses including hotels, daily dining, local transit, museum activities…
- VAT CalculatorCalculate VAT instantly. Add tax to net prices or remove tax from gross prices.
- Gas Mileage & Fuel Cost CalculatorCalculate MPG from odometer readings and gallons used, or estimate trip fuel cost.
- Self-Employment Tax CalculatorCalculates 2026 self-employment tax under IRS Schedule SE: 92.35% net earnings, 12.4% Social Security up to…
- Debt Snowball vs. Avalanche CalculatorRun debt snowball and avalanche side by side on your own balances, APRs, and minimum payments to see the real…
- Debt-to-Income (DTI) Ratio CalculatorCalculate both your front-end (housing-only) and back-end (all-debt) debt-to-income ratios, the numbers lenders…
- Debt Service Coverage Ratio CalculatorA DSCR calculator that computes NOI ÷ annual debt service and checks it against the 1.25x threshold most…
- Rental Yield CalculatorA rental yield calculator computing gross and net rental yield from property value, monthly rent, and annual…
- Sales Tax CalculatorAdd sales tax to a price or back it out of a total, using 2026 state rates for all 50 states and DC plus your…
- Roth IRA CalculatorSee your 2026 Roth IRA contribution limit from your income ($7,500, or $8,600 at 50+), the exact phase-out math…
- RMD CalculatorCalculate your required minimum distribution from the IRS Uniform Lifetime Table, see your RMD age (73 or 75) and…
- CAGR CalculatorCalculate CAGR from start and end values or exact dates, find the end value or time needed at a rate, and compare…
- Depreciation CalculatorCreate a full depreciation schedule with straight-line, double declining balance, sum-of-the-years’ digits or…
- 50/30/20 Budget CalculatorSplit your take-home pay with the 50/30/20 rule or a custom ratio, list your expenses as needs, wants or savings…
- Rent Affordability CalculatorSee how much rent you can afford by the 30% rule, the 40x landlord rule and a debt-adjusted limit, then check if a…
- Debt Consolidation CalculatorCompare your debts with a consolidation loan — monthly payment, payoff time, total interest and origination fee…
- Pay Raise CalculatorNew pay after a raise by percent or amount, or the percent from your new pay — hourly, weekly, biweekly, monthly…
- IRR CalculatorInternal rate of return for evenly spaced or dated cash flows (XIRR), with NPV, MIRR, payback, an NPV chart and a…
- Bond Yield CalculatorYield to maturity from a bond’s price, or price from yield, with current yield, yield to call, effective annual…
- Mortgage Points CalculatorShould you buy mortgage points? Compare payments, find the break-even month including the lower balance, and see…
Developer Tools (58)
- JSON Formatter & ValidatorFormat and validate JSON in your browser, nothing uploaded. Covers the six value types, why trailing commas fail…
- Base64 Encoder & DecoderA Base64 encoder decoder for text, covering the URL-safe alphabet, padding and the 33% size overhead — and why…
- URL Encoder & DecoderA URL encoder decoder with a full percent-encoding reference and the encodeURI vs encodeURIComponent difference…
- Regex TesterTest regular expressions live against the JavaScript engine, with a flavor comparison for Python, Java, .NET and…
- IP Address LookupLook up any IP address to find its geolocation, ISP, timezone, and more. Free IP lookup tool powered by ipapi.co.
- Password GeneratorA password generator with a passphrase mode: six random words is 77.5 bits, the same as a 12-character password.
- Diff Checker & Text CompareCompare two texts side by side in your browser, nothing uploaded. Explains unified diff format and why CRLF line…
- CSV to JSON ConverterConvert CSV to JSON in your browser, with control over type inference so leading zeros survive.
- Markdown Live PreviewerWrite and preview GitHub-flavored markdown in real time. Features instant split-screen HTML rendering, code syntax…
- HEX to RGB Color ConverterA HEX to RGB converter that also gives RGBA, HSL and CMYK, with a live picker, contrast check, and the 8-digit hex…
- HTML to Markdown ConverterConvert HTML code snippets, articles, and rich text to clean GitHub-flavored markdown with code fences, headers…
- Cryptographic Hash GeneratorGenerate secure cryptographic checksums and hashes (SHA-256, SHA-512, SHA-384, SHA-1) directly in your browser…
- JWT Token Decoder & InspectorA JWT decoder that also verifies the signature in your browser: HS256 with a secret, RS256 and ES256 with a public…
- Cron Expression GeneratorA cron generator with plain-English output, common recipes, and the field-count differences for Quartz, Spring and…
- SQL Formatter & BeautifierFormat SQL for readable diffs and code review, with an identifier-quoting table for PostgreSQL, MySQL, T-SQL…
- UUID / GUID v4 GeneratorA UUID generator for bulk, cryptographically secure Version 4 UUIDs and GUIDs, with uppercase and hyphen-removal…
- Unix Epoch Timestamp ConverterConvert Unix epoch timestamps (seconds & milliseconds) to human-readable UTC and local dates, or convert any date…
- HTML Entity Encoder / DecoderEncode and decode HTML entities with a full reference table, plus why entity encoding alone is not safe inside…
- cURL Command to Code ConverterA curl converter that turns a pasted command into Fetch, Axios and Python requests code, parsed in your browser…
- CSS Box Shadow GeneratorA CSS shadow generator with sliders for offset, blur, spread and color, plus layering, inset, live preview and…
- CSS Gradient GeneratorCreate vibrant CSS linear and radial gradients with custom color stops, angles, designer presets, and 1-click CSS…
- SEO URL Slug GeneratorTurn any title into a clean lowercase URL slug. Covers accent stripping limits, why hyphens beat underscores, and…
- DNS Record & Nameserver InspectorInspect live DNS records, mail exchangers (MX), SPF/TXT records, and nameservers for any domain using Cloudflare…
- HTTP Status Code ExplainerHTTP status code lookup for every standard response code — 200, 301, 404, 500, 502, 503 — in plain English, with…
- User Agent & Browser InspectorA user agent analyzer for your own browser string: operating system, browser engine, version, screen resolution…
- IP Subnet Mask & CIDR CalculatorA subnet mask calculator for IPv4: CIDR prefix, network and broadcast address, usable host range, wildcard mask…
- SSL / TLS Certificate & Security InspectorAn SSL certificate checker with an honest limit: a browser can prove the handshake succeeded, not read the…
- TCP / UDP Port Database ReferenceSearch common TCP/UDP network ports (22, 80, 443, 3306, 5432, 8080) with protocol definitions, standard service…
- JSON to XML & XML to JSON ConverterA JSON to XML converter that runs both directions and re-parses its own output before showing it, so what you copy…
- JSON to YAML & YAML to JSON ConverterA JSON to YAML converter that runs both ways in your browser, covering implicit typing: why 1.20 becomes 1.2 and…
- MAC Address & OUI Vendor LookupMAC address lookup against the IEEE OUI registry: identify the manufacturer — Apple, Cisco, Intel, Samsung…
- HTML, CSS & JSON Code Minifier & FormatterMinify and beautify HTML, CSS, and JSON code client-side. Reduce file payload size, strip whitespace, and improve…
- Interactive Regex Builder & TesterTest and debug regular expressions in real-time with group capture inspection, flag switches (g, i, m), and…
- JSON API Mock Test Data GeneratorGenerate realistic mock JSON data arrays for frontend testing and prototyping.
- Linux Chmod Permissions CalculatorCalculate Linux/Unix file permissions with interactive read, write, and execute checkboxes.
- Markdown Table Generator & SpreadsheetCreate and format Markdown tables using a visual spreadsheet editor. Add rows, columns, adjust text alignment…
- WCAG 2.2 Color Contrast Ratio CalculatorA color contrast checker for text and background: the WCAG 2.2 ratio with AA and AAA pass/fail for normal and…
- RFC 4648 Base32 Encoder & DecoderEncode text to Base32 or decode Base32 strings into plain text using standard RFC 4648 alphabet.
- JWT (JSON Web Token) Builder & SimulatorA JWT builder that signs for real with Web Crypto HMAC-SHA256, plus decode and verify.
- Security HTTP Response Header GeneratorGenerate HSTS, Content-Security-Policy, X-Frame-Options, Referrer-Policy and Permissions-Policy response headers…
- Social Open Graph & Twitter Card GeneratorAn Open Graph generator for og: and Twitter Card meta tags, with a live preview of how the link renders on…
- SEO Robots.txt & Sitemap Directives GeneratorA robots.txt generator with correct Allow/Disallow precedence — and why Disallow blocks crawling but does not stop…
- Binary, Decimal & Hex ConverterA binary decimal hex converter (and octal) with arbitrary precision, so 64-bit values stay exact.
- Music BPM to Delay Milliseconds & LFO Rate CalculatorCalculate audio delay time in milliseconds (ms), reverb pre-delay, and LFO frequency in Hz for whole, half…
- Favicon GeneratorMake a favicon from an image, letters or an emoji. A genuine multi-image .ico, the small modern icon set, and four…
- Canonical URL GeneratorA canonical URL generator that strips tracking parameters, normalizes protocol/www/trailing-slash, and outputs a…
- Email Deliverability CheckerAn email deliverability checker that looks up a domain's real SPF and DMARC DNS records, and checks common DKIM…
- Meta Tag GeneratorA meta tag generator that produces title, description, robots, Open Graph, and Twitter Card tags from one form…
- CSS Specificity CalculatorA CSS specificity calculator that breaks any selector into its (ID, class, element) score and compares two…
- XML Sitemap GeneratorAn XML sitemap generator that turns a pasted list of URLs into a valid sitemap.xml with lastmod, changefreq, and…
- CPS TestTest your click speed in 1, 5, 10, 30 or 60-second rounds. See clicks per second live, a second-by-second chart…
- Keyboard TesterPress keys to test your keyboard online: every key lights up on a full layout, with key codes, rollover (keys held…
- What Is My Screen ResolutionInstantly see your screen resolution, the real physical pixels behind Windows or Mac scaling, your browser…
- Dead Pixel TestCheck a monitor, laptop, TV or phone for dead, stuck or hot pixels and backlight bleed with full-screen solid…
- Spacebar CounterCount how many times you can press the spacebar in 5, 10, 15, 30 or 60 seconds, or with no time limit.
- Online HTML EditorWrite HTML, CSS and JavaScript with a live preview and console in an isolated sandbox.
- Refresh Rate TestMeasure your screen’s refresh rate in Hz, frame time and dropped frames in the browser, with a moving-block…
- PX to REM ConverterConvert px to rem and rem to px at any root font size, or paste a whole stylesheet to convert every value at once.
Text & Language (25)
- Word CounterCount words, characters, sentences, and paragraphs in your text. Estimate reading time.
- Case ConverterA case converter for every case at once — sentence, title (AP and Chicago), camelCase, PascalCase, snake_case…
- Lorem Ipsum GeneratorA lorem ipsum generator using the real 186-word Cicero vocabulary: paragraphs, sentences, words or list items…
- Character CounterCounts what you actually see, not UTF-16 units — so an emoji counts as one, not two.
- Readability Score CheckerA readability checker scoring Flesch Reading Ease, Flesch–Kincaid, Gunning Fog and Coleman–Liau — and listing the…
- Words to Pages CalculatorConvert word count to exact document page count. Customize single/double spacing, font size (10pt, 12pt), font…
- Duplicate Line RemoverRemove duplicate lines from text, email lists, and code instantly. Options for case matching, alphabetical…
- Text Reverser & Flip ToolReverse text, flip word order, invert line sequence, or generate upside-down unicode text.
- Keyword Density & Frequency CheckerA keyword density checker for 1-, 2- and 3-word phrases that shows what a page is actually about.
- English Dictionary & Audio PronunciationDictionary lookup for English words: definitions, parts of speech, IPA phonetics, example sentences and audio…
- Rhyme, Synonym & Antonym FinderFind perfect rhymes, near rhymes, synonyms, and antonyms for songwriting, poetry, and creative writing.
- Typing Speed TestA typing speed test that shows gross and net WPM side by side, so you can see exactly how much errors cost — not…
- Speech Duration & Reading Time by WPM Pace CalculatorEstimate spoken presentation duration and silent reading time based on word count and words per minute (WPM)…
- Reading Speed Test (WPM Calculator)Time yourself reading and find your actual words-per-minute, checked against the measured adult average from a…
- Palindrome CheckerA palindrome checker that ignores spaces, punctuation, and case to test whether a word, phrase, or number reads…
- Text to SpeechPaste any text and hear it read aloud with your device’s voices. No character limit, no signup, speed and pitch…
- Word UnscramblerEnter scrambled letters (use ? for blanks) to find every word they make, grouped by length with tile scores, plus…
- Wordle SolverEnter your guesses and tap each tile gray, yellow or green to see every word that still fits — and the next guess…
- Random Word GeneratorGenerate random English words — common or any — filtered by length, first letter, ending or letters they contain.
- Text to Binary TranslatorTranslate text to binary code and binary back to text, with full UTF-8 so emoji and accents work.
- NATO Phonetic Alphabet TranslatorSpell any name or code in the NATO phonetic alphabet (Alfa, Bravo, Charlie) with pronunciation, read it aloud, or…
- Online NotepadA free online notepad that saves as you type in this browser — multiple notes, word count, open and download .txt…
- Syllable CounterCount syllables in any word, sentence or poem with a 125,000-word pronunciation dictionary.
- Word Cloud GeneratorTurn any text into a word cloud in seconds. Remove common words, pick colors and vertical words, see word counts…
- Caesar CipherEncode and decode Caesar cipher and ROT13 online. Choose any shift from 1 to 25, or crack unknown text: all 25…
AI-Powered Tools (4)
- AI Text SummarizerSummarize long texts instantly using AI that runs in your browser. 100% private — your text never leaves your…
- AI Sentiment AnalyzerA sentiment analyzer scoring −100 to +100 sentence by sentence, so a mixed review reads as mixed.
- Background RemoverA background remover for portraits, running in your browser at full resolution. No credits, no account, no upload.
- Audio to Text ConverterTranscribe audio to text with Whisper AI running in your browser. MP3, M4A, WAV and more; copy text or download…
Image & Media (26)
- QR Code GeneratorGenerates QR codes entirely in your browser — nothing is uploaded. Static and permanent, so they never expire…
- Barcode Generator (EAN-13 / UPC-A)Generates a real, scannable EAN-13 or UPC-A barcode in your browser. Enter the product digits and the correct…
- Color Palette GeneratorPull a palette from a photo or build one from a color. Every swatch carries its WCAG contrast ratio, and the image…
- Aspect Ratio CalculatorCalculate aspect ratios and scale image and video dimensions proportionally without distortion.
- Target Aspect Ratio Pixel Crop Dimension CalculatorCalculate target cropped pixel dimensions (width × height) and sensor pixel retention percentages for 16:9, 4:3…
- Image CompressorAn image compressor for JPG, PNG and WebP to an exact file size or by quality.
- Image ResizerAn image resizer by pixels, percentage, inches or millimeters at a chosen DPI, with presets for Instagram…
- Image ConverterConvert between JPG, PNG and WebP with control over the background color behind transparency.
- PNG to JPG ConverterConvert PNG to JPG in your browser, choosing the color that replaces transparency instead of getting a black box.
- JPG to PNG ConverterConvert JPG to PNG without uploading anything. Honest about what it does and does not do: PNG stops further loss…
- Signature & Photo ResizerFit a signature or photo to exact pixel dimensions AND a KB range, not just a ceiling.
- Image CropperCrop to a locked aspect ratio and set the exact output pixels — in px, inches, cm or mm at any DPI.
- Image to Text (OCR)Extract text from an image in your browser, with a per-word confidence score so you can see where the recognition…
- SVG to PNGSVG to PNG at any scale with no loss. Checks first for external fonts, remote images and a missing viewBox — the…
- Image Color PickerPick colors from a photo as HEX, RGB and HSL. Samples an area rather than one noisy pixel, averages correctly, and…
- Passport Photo MakerCrop to 35×45 mm, 2×2 in or any size at a chosen DPI, with head-height guides, then lay copies onto a 4×6 or A4…
- QR Code ScannerScan a QR code from your camera or an image and see exactly what it contains.
- Mic TestTest your microphone in the browser: a live level meter in dBFS, clipping and background-noise checks, and a…
- Screen RecorderRecord your screen, a window or a tab with microphone and system audio in the browser.
- HEIC to JPG ConverterConvert iPhone HEIC photos to JPG or PNG in your browser. Batch convert, pick the quality, download as a ZIP…
- Webcam TestTest your webcam online: live preview, the real resolution and measured frame rate your camera delivers, its…
- Online Voice RecorderRecord your voice in the browser with pause and resume, a live level meter and mic choice, then download as WAV or…
- WebP to JPG ConverterConvert WebP images to JPG in your browser. Batch convert, choose quality and the background color for transparent…
- Decibel MeterMeasure sound level with your microphone: live dB(A) estimate, min, max and average, a level graph and noise…
- Rotate ImageRotate images 90°, 180° or any angle and flip them horizontally or vertically.
- Add Text to ImageAdd text to any photo in your browser: drag to position, choose font, size, color, outline and shadow, add several…
Weather & Environment (9)
- Weather ForecastWeather lookup for any city worldwide: current conditions and a 7-day forecast from the national meteorological…
- Sunrise & Sunset CalculatorFind sunrise and sunset times for any location and date. Calculate day length and golden hour.
- UV Index CheckerCheck the current UV index for any location. Get sun protection recommendations based on UV levels.
- Air Quality Index (AQI) & PM2.5 CheckerAn air quality checker for any city: real-time US AQI with the PM2.5, PM10, ozone and nitrogen dioxide readings…
- Moon Phase & Lunar Calendar TrackerA moon phase tracker showing the current phase, illumination percentage, lunar age, and the exact countdown to the…
- Altitude & Elevation FinderFind the ground elevation and altitude in feet and meters for any city, landmark, or mountain peak worldwide.
- Heat Index & Real-Feel CalculatorA heat index calculator running the full NWS procedure, including the low-humidity and high-humidity corrections…
- Wind Chill Index & Frostbite Risk CalculatorA wind chill calculator using the 2001 NWS index, with frostbite times — and what wind chill is not: it never…
- Dew Point, Wet Bulb & Psychrometrics CalculatorGet dew point, wet bulb, frost point and absolute humidity, the pressure dew point in ppm for compressed air, and…
Data & Reference (23)
- Country Information LookupCountry info for 250 countries and territories — population, capital, area, currencies, languages, calling code…
- Random Quote GeneratorGet random inspirational, motivational, and famous quotes. Filter by author or category.
- Joke GeneratorGet random jokes in multiple categories — programming, puns, dark humor, and more.
- Trivia Quiz GeneratorTest your knowledge with random trivia questions. Choose category, difficulty, and question count.
- ZIP Code & Postal Code LookupFind city names, states, counties, latitude, and longitude coordinates from any US or international postal code.
- NASA Astronomy Picture of the DayExplore breathtaking daily NASA space photography, cosmic nebula images, and expert astronomical explanations.
- Random Fun Facts & Trivia GeneratorDiscover surprising, verified, and fascinating random facts about history, animals, science, and the world.
- World Clock & Global Timezone ConverterA world clock converter across 12 major cities, with offsets shown to the minute because not every zone is a whole…
- Name Origin, Nationality & Age PredictorDiscover the most probable nationality, country of origin, and median age associated with any first name using…
- Dog & Cat Breed EncyclopediaExplore popular dog and cat breeds with details on size, average lifespan, temperament, energy levels, and…
- Random Name PickerA random name picker that draws one or several winners with no repeats, using the same cryptographically secure…
- Coin FlipFlip a virtual coin for a fair heads-or-tails answer, or flip up to 1,000 at once and see the counts, percentages…
- Dice RollerRoll any dice with standard notation like 2d6+3, 4d6 drop lowest or d20 advantage, and see the exact odds of every…
- Printable CalendarMake a free printable calendar PDF for any year: 12 monthly pages or one yearly page, with U.S.
- Military Time ConverterConvert military (24-hour) time to standard AM/PM time and back, see how to say it (“fourteen thirty hours”), and…
- Week NumberSee today’s week number under both ISO 8601 (Monday start) and the U.S.
- Distance Between Cities CalculatorFind the straight-line distance between two cities or coordinates in miles, kilometers and nautical miles, plus…
- Tournament Bracket GeneratorMake a single-elimination tournament bracket for 2–64 teams with proper seeding and byes.
- Julian Date ConverterConvert dates to Julian dates both ways: the YYDDD day-of-year code used on packaging and by the military, and the…
- Chinese Zodiac CalculatorFind your Chinese zodiac animal, element and yin or yang from your birth date, using the real Lunar New Year so…
- Bar Graph MakerMake a bar graph from pasted data in seconds: single or grouped bars, vertical or horizontal, sorted, with value…
- Shoe Size ConverterConvert shoe sizes between US men’s, women’s and kids’, UK, EU and Japan cm, or find your size from foot length.
- Ring Size ConverterConvert ring sizes between US, UK letters, EU/ISO, Japanese and Swiss sizes, or find yours from a diameter, a…
Health & Fitness (26)
- TDEE & Calorie CalculatorA TDEE calorie calculator using Mifflin-St Jeor for BMR, with targets for loss, maintenance or gain — and how wide…
- Daily Water Intake CalculatorHow much water to drink daily by weight, exercise and climate — and the part other calculators miss: the official…
- Macro & Calorie Deficit CalculatorDaily protein, carb and fat targets from the Mifflin-St Jeor equation — and the only calculator that checks your…
- US Navy Body Fat CalculatorEstimate body fat from a tape measure with the US Navy formula, cross-checked against the BMI method — and see the…
- Ideal Body Weight (IBW) CalculatorAn ideal body weight calculator comparing all four formulas plus adjusted body weight — and why they disagree by…
- Target Heart Rate CalculatorGet your five training zones from a max heart rate formula that is actually validated — plus why 220 minus your…
- Intermittent Fasting Tracker & TimerTrack your daily intermittent fast with live countdown timer, 16:8, 18:6, 20:4 protocol presets, and biological…
- Sleep Cycle & Bedtime CalculatorA sleep calculator built on real 90–110 minute cycles, with the hours the AASM recommends by age and a flag on any…
- Lean Body Mass (LBM) CalculatorA lean body mass calculator running three published equations, with the James formula dropped automatically past…
- Calorie Burned Activity CalculatorA calorie burn calculator for 30+ activities using standard MET values — plus the number others omit: how much you…
- Pregnancy Due Date CalculatorCalculate your estimated baby due date, current gestational age in weeks and days, and pregnancy trimester…
- Blood Pressure Category CheckerA blood pressure checker that averages your readings the way the AHA asks, compares both arms, and sizes your…
- Running Pace & Split CalculatorA running pace calculator for km and mile splits, treadmill speed, and race predictions that use Riegel's formula…
- Alcohol Units, BAC Clearance & Calories CalculatorCalculate standard alcohol units, pure ethanol grams, drink calories, and estimated biological body clearance…
- Workout Sweat Rate & Electrolyte CalculatorCalculate hourly fluid loss sweat rate (L/hr), percentage dehydration, and sodium electrolyte replacement…
- Sleep Debt Deficit & Circadian Recovery CalculatorCalculate your cumulative weekly sleep debt deficit and generate an optimal circadian-friendly gradual recovery…
- UV Index & Safe Vitamin D Sun Exposure TimerCalculate safe sunlight exposure time in minutes for optimal Vitamin D synthesis (1,000–2,000 IU) based on UV…
- Jet Lag Circadian Shift & Recovery PlannerBeat jet lag with a pre-flight sleep shift plan. Get day-by-day bedtime adjustments and light exposure timing for…
- Waist-to-Hip Ratio CalculatorCalculate your waist-to-hip ratio in inches or centimeters and compare it to the WHO thresholds for increased…
- One-Rep Max (1RM) CalculatorEstimate your one-rep max from any submaximal set using both the Epley and Brzycki formulas side by side, plus a…
- VO2 Max CalculatorA VO2 max calculator using the Rockport 1-mile walk test or the Cooper 12-minute run test, both with published…
- Reaction Time TestTest your reaction time: wait for green, then click or press Space. Five rounds give your average, median, fastest…
- BAC CalculatorEstimate blood alcohol concentration from drinks, weight, sex and time with the Widmark formula, plus a range and…
- Army Body Composition Calculator (WHtR)Check the Army waist-to-height ratio standard: enter height and waist to see your WHtR, whether it is under 0.55…
- White Noise GeneratorPlay white, pink or brown noise generated live in your browser, with a tone control and sleep timer that fades…
- Steps to Miles ConverterConvert steps to miles or kilometers — and miles to steps — using your height or your own measured step length.
Education (23)
- College & High School GPA CalculatorSemester, cumulative and weighted GPA in one place — with AP and honors bumps, pass/fail exclusions, and a note on…
- Pomodoro TimerA 25/5 Pomodoro timer with custom intervals, automatic long breaks and an alarm, driven by the system clock so it…
- Stopwatch & Countdown TimerA stopwatch timer with laps and countdown, driven by the system clock so it stays accurate in a background tab.
- Test Grade Percentage CalculatorCalculate test score percentages, letter grades (A+ to F), and GPA equivalents based on questions missed.
- Final Grade CalculatorCalculate the exact minimum score you need on your final exam to pass your class or earn your target letter grade…
- Roman Numeral ConverterConvert numbers and dates to Roman numerals and back — and unlike most converters, it rejects invalid numerals…
- Book & ISBN Search ExplorerISBN book lookup in the Open Library catalog — title, authors, publisher, date, pages, subjects and cover — with…
- Baby Name Meaning & Origin ExplorerSearch hundreds of popular boy, girl, and unisex baby names with cultural origins, historical meanings, and…
- World Flags & Capital Cities QuizA country flag quiz drawn from the 193 UN member states: half flags, half capitals, ten fresh questions a round…
- Interactive Periodic Table of ElementsA periodic table explorer: search any element by name, symbol or atomic number for its atomic weight, group…
- Kinematic Velocity & Motion CalculatorSolve classical physics kinematic motion equations. Calculates final velocity (v = v₀ + at), displacement distance…
- Ohms Law & Electrical Power CalculatorEnter any two of voltage, current, resistance or power and get the other two — plus the resistor wattage rating…
- 4-Band Resistor Color Code DecoderA resistor color code calculator that runs both ways: bands to ohms, and the colors for 1k, 10k and 100k — plus…
- Morse Code TranslatorA Morse code translator both ways using the complete ITU alphabet, with real-timing audio, adjustable speed and…
- English Text to Grade 1 Braille TranslatorConvert English letters, numbers, and punctuation marks into standard Grade 1 Unicode tactile Braille patterns…
- pH Scale & Hydrogen Ion [H+] Concentration CalculatorpH from concentration, molarity or Ka — with the temperature caveat every other calculator omits: pH + pOH = 14 is…
- Musical Note Pitch to Audio Frequency (Hz) FinderConvert musical note pitch and octave numbers to equal temperament frequency in Hertz (Hz), MIDI key number, and…
- Comparative Advantage CalculatorA comparative advantage calculator that computes opportunity cost for two producers and two goods, and shows who…
- Online MetronomeA free online metronome with sample-accurate timing: 20–300 BPM, time signatures, accented downbeats, subdivisions…
- Guitar TunerTune your guitar, bass or ukulele with your microphone. Standard, Drop D, DADGAD, open and half-step-down tunings…
- Molar Mass CalculatorType a chemical formula to get its molar mass in g/mol, the percent composition by element, and grams ↔ moles…
- Chemical Equation BalancerBalance any chemical equation instantly, including redox and ionic equations with charges.
- Online Tone GeneratorPlay a pure tone at any frequency from 1 Hz to 20 kHz. Sine, square, triangle or sawtooth, left/right channel…
Business (39)
- Profit Margin CalculatorA profit margin calculator for gross margin, markup, net profit and breakeven — plus the price that hits a target…
- Invoice GeneratorCreate professional invoices instantly online with taxes, custom currencies, and dynamic line items.
- Discount CalculatorA discount calculator for stacked "extra % off" deals that compound rather than add, sales tax, and both reverse…
- UTM Campaign URL BuilderBuild custom campaign tracking URLs with standard UTM parameters for Google Analytics, Meta Ads, TikTok, and…
- Sales Commission CalculatorCalculate total sales commission, over-quota accelerators, base salary, and on-target earnings (OTE) with…
- Breakeven Point CalculatorA breakeven calculator for units and revenue from fixed costs and contribution margin, plus margin of safety and…
- Return on Investment (ROI) CalculatorCalculate return on investment and the annualized rate that makes different holding periods comparable.
- PayPal Fee CalculatorA PayPal fee calculator for goods and services (3.49% + $0.49) and friends and family, the 1.5% international and…
- Stripe Fee CalculatorCalculate Stripe credit card processing deductions (2.9% + 30¢), international card fees, and net payout revenue.
- Markup CalculatorCalculate retail selling price, dollar profit, and understand the difference between Markup % and Gross Profit…
- CPM (Cost Per Mille) CalculatorA CPM calculator that solves all three ways: cost per thousand impressions from a bill, the budget for a reach…
- A/B Test Significance CalculatorAn AB test calculator for significance: p-value, Z-score, the confidence interval on the difference, observed…
- CTR (Click-Through Rate) CalculatorA CTR calculator for ads and organic search, compared against a cited benchmark for your channel and industry…
- Customer Lifetime Value (LTV) CalculatorCalculate Customer Lifetime Value (LTV / CLV), gross profit LTV, and LTV-to-CAC health ratio for SaaS…
- RFM Customer Segmentation CalculatorScore a customer on Recency, Frequency and Monetary value to get their RFM segment, from Champions to Lost, plus a…
- Freelance Hourly Rate CalculatorA freelance rate calculator for hourly and day rates from your target take-home, overheads, tax and realistic…
- Discounted Cash Flow (DCF) CalculatorCalculate the intrinsic fair value of a company or stock using a 5-year Discounted Cash Flow (DCF) model with…
- Number to Words ConverterSpell out a number or dollar amount in words — the check-writing xx/100 form for amounts, or plain English for any…
- Market Share CalculatorA market share calculator that also computes the Herfindahl-Hirschman Index, using the current 2023 DOJ/FTC Merger…
- Affiliate Marketing Commission & EPC CalculatorAn affiliate commission calculator for monthly earnings, earnings per click (EPC) and revenue from your traffic…
- SaaS Subscription MRR & ARR CalculatorCalculate software-as-a-service Monthly Recurring Revenue (MRR), Annual Recurring Revenue (ARR), logo churn rate…
- Task Prioritization CalculatorRank tasks using Eisenhower Matrix, RICE, and ICE scoring. Free workload optimization and productivity auditing.
- Time Card CalculatorA weekly time card calculator with clock in/out, unpaid breaks, overnight shifts, hourly pay, and FLSA overtime…
- SEO Keyword Difficulty CalculatorA manual keyword difficulty scorecard for when you lack an Ahrefs or Semrush subscription — scores brand…
- Context Switching Cost CalculatorA context switching cost calculator using Gloria Mark's (UC Irvine) measured 23-minute-15-second average…
- Content Gap AnalyzerA content gap analyzer that compares two pasted topic lists — yours and a competitor's — to show exactly which…
- Cookie Consent ROI CalculatorEstimates revenue your analytics cannot see because of cookie consent declines, and compares compliance spend…
- Bundle Pricing CalculatorA bundle pricing calculator that sums item prices and costs, applies your discount, and shows the resulting margin…
- Terms of Service GeneratorA Terms of Service generator that produces a standard-clause starting template — acceptance, accounts, IP…
- SERP Preview ToolA SERP preview tool that shows how a page title, URL, and meta description will render — and truncate — in Google…
- Cart Abandonment CalculatorA cart abandonment calculator that computes your abandonment rate, the revenue at stake, and how much remarketing…
- Featured Snippet OptimizerA featured snippet optimizer that scores an answer paragraph against the patterns that actually win Google's…
- Revenue Forecast CalculatorA revenue forecast calculator that projects future revenue from a starting figure and a growth rate per period…
- Meeting Cost CalculatorA meeting cost calculator that turns attendee count, salary, and duration into a real dollar figure — plus the…
- Conversion Rate CalculatorA conversion rate calculator that computes your rate from visitors and conversions, and works backwards to show…
- Esports Tournament Prize CalculatorAn esports tournament prize calculator that splits a prize pool across placements, then divides each team's payout…
- Burn Rate & Cash Runway CalculatorA burn rate calculator that computes net and gross monthly burn from your cash balance history, and how many…
- NPS CalculatorAn NPS calculator that turns promoter, passive, and detractor response counts into your Net Promoter Score on the…
- Customer Acquisition Cost (CAC) CalculatorA customer acquisition cost calculator from marketing and sales spend, with an optional LTV:CAC ratio to check if…
PDF Tools (9)
- Merge PDFCombine PDFs into one file without uploading them anywhere. Set the order, see page counts, flatten form fields.
- Split PDFExtract a page range, delete pages, or split a PDF into separate files. Multiple files come back as one ZIP.
- JPG to PDF ConverterTurn JPG, PNG and WebP images into a single PDF. Page size matched to each image or set to A4 or Letter, auto…
- PDF to JPG ConverterTurn PDF pages into JPG, PNG or WebP at a resolution you choose, with the output pixel size shown before you…
- Rotate PDFTurn PDF pages 90, 180 or 270 degrees and save the rotation into the file.
- Compress PDFShrink a PDF to an exact target size, and be told first whether it is a scan (safe) or real text (you lose the…
- Watermark PDFStamp text across every page or a selection: diagonal or straight, any size, opacity and color.
- Add Page Numbers to PDFNumber a PDF with the position and format you want, skipping a cover and starting from any number.
- PDF to TextPull the real text out of a PDF with paragraphs rebuilt from the document’s own line spacing.
Social Media (4)
- Instagram Caption FormatterAn Instagram caption formatter that fixes a real problem: Instagram collapses blank lines pasted from other apps.
- Fancy Text GeneratorTurn text into 24 copy-and-paste Unicode styles — bold, italic, cursive, gothic, bubble, small caps and more — for…
- Emoji Copy and PasteSearch and copy any emoji with one tap — every emoji through Emoji 17.0, with skin tones, names, codepoints and a…
- Symbols Copy and PasteCopy and paste 900+ text symbols — arrows, stars, check marks, math, currency, Greek letters and more — with their…