Discount Calculator
Three-in-one discount calculator: find the sale price after a % off, the discount % between two prices, or the original price before a known discount.
%
Three discount-related questions in one tool: what's the sale price after a percentage off, what percentage off was a sale, and what was the original price before a known discount. Switch between modes with the tabs.
All math runs in your browser — currency-agnostic, no sign-up, no tracking of the numbers you enter.
How to use
- Pick a mode: Find sale price (you know % off), Find discount % (you know both prices), or Find original price (you know sale price and the % off applied).
- Enter the two known values.
- The result card shows the answer plus the absolute amount saved.
Frequently asked questions
- What's the difference between the three modes?
- Find sale price: you know the original price and the discount % — get the sale price. Find discount %: you know both prices — get the % off. Find original price: you know the sale price and the % off applied — get the original price (the "was" price).
- How do I calculate the original price from a sale?
- If something is on sale at S after a discount of d%, the original price was S / (1 − d/100). For example, $40 after 20% off was originally $40 / 0.8 = $50.
- Are the calculations rounded?
- Yes, displayed to two decimal places. Internally the math uses full precision — there's no compounding rounding error if you switch modes.
Related tools
- Percentage CalculatorCalculate X% of Y, find what % X is of Y, or compute the % change between two numbers. The three percentage questions that come up most often.
- Tip CalculatorCalculate tip on a restaurant bill and split the total fairly across the table. Quick percentages (10/15/18/20/25) plus custom rates and party size.
- Sales Tax / VAT CalculatorAdd VAT or sales tax to a net amount, or split a tax-inclusive amount back into net and tax. Custom rate plus presets for common rates worldwide.