About this tool
A discount calculator computes the final price of an item after applying a percentage reduction. The formula is straightforward: Sale Price = Original Price x (1 - Discount % / 100). For example, a $80 item at 25% off costs $80 x 0.75 = $60, saving you $20.
This calculator handles common real-world scenarios beyond simple single discounts: (1) Stacked discounts — when two or more percentage discounts apply sequentially (e.g., 20% off then an additional 10% off is NOT 30% off — it is 28% total); (2) Sales tax on the discounted price — calculates the after-tax total; (3) Reverse calculation — finds the original price when you know the sale price and discount percentage.
Whether you are shopping during Black Friday, comparing coupon stacks, or planning a business markdown strategy, this tool gives you exact numbers instantly. All calculations run locally in your browser — no purchase data is collected.
Practical Usage Examples
Step-by-Step Instructions
Enter the original price of the item.
Enter the discount percentage (e.g., 25 for 25% off).
The sale price and savings amount appear instantly.
Optional: Enter a second discount for stacked discount calculation.
Optional: Enter your local sales tax rate to see the after-tax total.
Use "Reverse" mode to find the original price from a known sale price.
Core Benefits
Instant calculation of sale price and savings amount.
Stacked/double discount support (sequential percentage reductions).
Sales tax calculation on discounted price.
Reverse discount mode (find original price from sale price).
100% client-side — no shopping data is collected.
Free, no signup, works offline after first load.
Frequently Asked Questions
Multiply the original price by (1 - discount/100). For 25% off $80: $80 x (1 - 0.25) = $80 x 0.75 = $60. Your savings are $80 - $60 = $20.
No. Stacked discounts are applied sequentially, not added. 20% off $100 = $80, then 10% off $80 = $72. That is a 28% total discount, not 30%. Our stacked discount mode calculates this correctly.
Use the reverse formula: Original Price = Sale Price / (1 - Discount/100). If an item is $60 after 25% off: $60 / 0.75 = $80 original price.
Sales tax is calculated on the discounted (sale) price, not the original price. If an item is $100 with 20% off, the taxable amount is $80, not $100.
Yes. All calculations happen locally in your browser. No pricing data, purchase information, or personal data is ever sent to any server.