How to Calculate Percent Off
A percent off reduces the original price of an item by a given percentage. "25% off" means the sale price is 25% lower than the original, and the buyer pays only the remaining 75%. This calculator works in any direction - find the sale price from a percent off, find the original price from a sale, or find what percentage was taken off when both prices are known.
To find the savings and sale price from the original price and a percent off:
Savings = Original Price × Percent Off ÷ 100
Sale Price = Original Price - Savings
For an original price of $80 at 25% off:
- Savings = $80 × 25 ÷ 100 = $20
- Sale Price = $80 - $20 = $60
To find the original price when only the sale price and the percent off are known, use the reverse formula:
Original Price = Sale Price ÷ (1 - Percent Off ÷ 100)
For a sale price of $60 at 25% off:
- Original Price = $60 ÷ (1 - 0.25) = $60 ÷ 0.75 = $80
To find the percent off when the original price and the sale price are both known:
Percent Off = (Original Price - Sale Price) ÷ Original Price × 100
For an original price of $80 reduced to a sale price of $60:
- Percent Off = ($80 - $60) ÷ $80 × 100 = $20 ÷ $80 × 100 = 25%
Using This Calculator
Beyond the four basic fields, the calculator has several features that make percent-off math faster. Here is what each does and when to use it.
Percent picker
The dropdown next to the Percent off field offers a quick list of common discount percentages from 5% to 75% in 5-point steps. Picking a value fills the field for you - useful for the most frequent retail discounts (10%, 15%, 20%, 25%, 50%) without having to type. For any other percentage, type the number into the field directly.
Percent off comparison
The comparison table on the right shows what the sale price and savings would be at several common discount percentages (5%, 10%, 15%, ..., up to 75%) for the original price you entered. It helps you see at a glance how much a deeper or shallower percent off would change the result - useful for comparing competing offers or deciding "how much more do I need off to hit my target price". The table is hidden when the original price field is empty.
Currency switcher
The dropdown next to the Original Price field switches between 10 currencies (USD, EUR, GBP, CAD, AUD, CHF, TRY, BRL, MXN, INR). The selected currency symbol is applied to all monetary fields and results. Values you have entered are kept when you switch - only the symbol changes.
Share link
Each calculation produces a URL containing the original price, percent off, and currency as hash parameters (for example: #original=80&percent=25¤cy=USD). Copy the link and send it - the recipient opens the calculator with your exact values pre-filled. The hash is cleared from the address bar after loading, so the shared values do not linger in browser history.
Saved results
The Save button stores your current calculation. Saved entries appear in a table below the calculator showing date, time, currency, and the four values. Up to 30 results are kept in your browser's local storage; when you reach the limit, the calculator asks before replacing the oldest. Data stays on your device only - it is not synced or sent anywhere.
Frequently Asked Questions
What is percent off?
"Percent off" is a way to express a discount as a percentage of the original price. "25% off" means the buyer pays 75% of the original price, and the seller takes 25% off the top. The percent off calculator above finds the sale price, savings, or original price when you enter any two of the four values.
How do I calculate 10%, 20%, or 50% off?
The same formula works for any percentage. Multiply the original price by (100 - Percent Off) / 100, or equivalently, multiply by the complement: for 10% off multiply by 0.90, for 20% off by 0.80, for 50% off by 0.50.
- 10% off $80 = $80 × 0.90 = $72 (save $8)
- 20% off $80 = $80 × 0.80 = $64 (save $16)
- 50% off $80 = $80 × 0.50 = $40 (save $40)
How do I find the original price from a sale price?
If you know the sale price and the percent off, divide the sale price by (1 - Percent Off / 100) to find the original price. For a sale price of $60 at 25% off: $60 ÷ (1 - 0.25) = $60 ÷ 0.75 = $80. In the calculator, enter the sale price and the percent off, leave the original price empty, and the result appears.
What if two discounts are applied one after another?
Two percentages applied in sequence (stacked discounts) do not add up. The second percent applies to the already-reduced price, not the original. A $100 item with "20% off, then extra 10% off" becomes $100 × 0.80 = $80, then $80 × 0.90 = $72 - that is 28% off, not 30%. For the full formula and a table of common stacks, see the Stacked Discounts section in our Discount Calculator.
What's the difference between percent off and discount?
Mathematically, "percent off" and "discount" are the same when the discount is expressed as a percentage - both reduce the original price by a given percentage. The terms are used interchangeably in retail. This Percent Off Calculator is focused on the simpler case of percentage-based reductions, with a quick-pick menu of common percentages (5%, 10%, 15%, ..., 75%). If you need to work with fixed-amount discounts ($10 off, $20 off coupons) or want to model two discounts stacked together, use our Discount Calculator instead.
Other money-related calculators on Calculator-1.com:
- Discount Calculator - calculate the sale price, savings, or discount amount from any two of the four values.
- Markup Calculator - work out the selling price from cost and markup percentage (or any two of cost, markup, selling price, profit).
- Margin Calculator - calculate profit margin from cost and revenue, or solve for any of the related values.
- Tip Calculator - calculate the tip amount, total bill, and per-person split for any service percentage.
- Money Counter - count physical cash by entering the quantity of each banknote and coin denomination. Supports 10 currencies.
Disclaimer
This calculator and the information above are provided for general guidance only. The formulas and examples shown describe standard percent-off arithmetic; specific offers may include additional rules (minimum purchase, exclusions, expiration, stacked discounts) that the calculator does not account for.
The calculator processes your data locally in your browser - original price, percent off, sale price, and savings values are not transmitted to our servers. Any saved results stay on your device.
