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By Today Coupon List editors · Updated
Quick answer. To calculate percent off, multiply the original price by the discount percentage written as a decimal, then subtract that amount from the original price. For example, 25% off $80 saves you $20, making the sale price $60. You can also multiply $80 by 0.75 to get $60 directly. These calculations give you the discounted item price before tax and shipping. [1]
In this guide
The Basic Percent Off Formula
A percent-off discount tells you how much of the original price is being removed. The word percent means per hundred, so 25% means 25 out of every 100. To use that percentage in a multiplication problem, divide it by 100.
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For example, 15% becomes 0.15, 20% becomes 0.20, and 35% becomes 0.35. Once you have the decimal, multiply it by the original price to find the dollar amount saved. Subtract those savings from the original price to find what you pay before any additional charges. [1]
There is also a shorter method. Subtract the discount percentage from 100%, convert the remaining percentage to a decimal, and multiply by the original price. If something is 25% off, you pay 75% of the original price, so you can multiply directly by 0.75.
| What to calculate | Formula | Example |
|---|---|---|
| Discount amount | Original price x discount decimal | $80 x 0.25 = $20 |
| Sale price | Original price x (1 – discount decimal) | $80 x 0.75 = $60 |
| Percent off from two prices | ((Original – sale) / original) x 100 | (($80 – $60) / $80) x 100 = 25% |
| Effective stacked discount | ((Original – final) / original) x 100 | (($100 – $72) / $100) x 100 = 28% |
Use an original price greater than zero when calculating a percentage from two prices. [1] [2]
Calculate 25 Percent Off an $80 Item
Suppose a jacket has an original price of $80 and an advertised discount of 25%. You want to know both the savings and the price you would pay. You can do the calculation in three short steps, using a phone calculator or a piece of paper.
The key is to calculate the discount from the original $80, not from a price that has already been reduced. For a single percentage discount, the multiplication and subtraction below give you the complete pre-tax sale price. [1]
- Convert the percentage Divide 25 by 100 to get 0.25. This is the decimal you will use for the discount.
- Find the dollar savings Multiply $80 by 0.25. The discount amount is $20.
- Subtract the savings Subtract $20 from $80. Your sale price is $60 before tax and shipping.
For a faster calculation, use the free discount calculator to find the sale price and dollar savings.
How to Find the Percent Off From Two Prices
Sometimes a product shows an original price and a reduced price without making the percentage clear. You can work backward using those two numbers. First subtract the sale price from the original price, then divide that difference by the original price and multiply by 100. [1]
Suppose an item was listed at $80 and is now $60. The difference is $20, and $20 divided by $80 equals 0.25. Multiply by 100 and you get 25% off. The $80 price is the reference point for this calculation.
Be careful about what that reference price represents. A discount calculated against a listed original price does not establish that shoppers regularly paid that amount. For Amazon shopping, checking an item's price history can give you more context before deciding whether the reduced price is attractive. [4]
Calculating Prices With Cents and Rounding
Discount math can produce more than two decimal places, especially when an item costs something like $24.99. For a simple estimate, keep the unrounded number through the calculation and round the final monetary result to the nearest cent. Actual merchants may use different line-item rounding methods, so your checkout total is the number to rely on. [3]
Take a hypothetical $24.99 item with 15% off. You pay 85% of the original price, so multiply $24.99 by 0.85 to get $21.2415. Rounded to cents, that is $21.24 before tax and shipping. The difference between the displayed original price and the rounded sale price is $3.75.
You can also calculate the discount directly: $24.99 multiplied by 0.15 equals $3.7485, which rounds to $3.75. Small fractions of a cent can appear during percentage calculations. Avoid rounding intermediate numbers repeatedly, because that can change the result by a cent.
Why Stacked Discounts Are Not Added Together
Two percentage discounts applied one after another generally do not add up to their advertised percentages. The second discount is calculated from the price left after the first reduction. That smaller starting amount changes the total savings. [2]
Imagine a $100 item receives 20% off, followed by another 10% off the reduced price. The first discount removes $20, leaving $80. The second discount removes $8, which is 10% of $80. Your final price is $72, and the total savings are $28.
To calculate the effective percentage, divide the $28 savings by the original $100 and multiply by 100. The result is 28% off, not 30%. This example only applies when the two offers can actually be combined and the second percentage applies to the reduced subtotal.
For offers involving multiple reductions, the coupon stacking calculator can help you compare the resulting prices. You can also read our guide to combining Amazon promotions for the kinds of offer terms to review before checkout. Do not assume two advertised promotions will both apply.
Check the terms of each offer and the final checkout breakdown before treating multiple discounts as combined savings.
Check the Final Price Before Calling It a Deal
A correct percent-off calculation tells you the size of a discount relative to a stated price. It does not tell you whether that price was typical, whether a similar item costs less elsewhere, or whether the purchase fits your budget. The dollar amount you actually pay deserves as much attention as the advertised percentage.
Amazon describes a price history feature that can show up to 365 days of data for eligible products. It also uses selected low-price labels, although these features are not available on every item. Price history can help put a reference price in context, but the availability of historical information varies by product. [4]
If you are comparing possible purchases, the price drops page can be another starting point for reviewing prices. For smaller purchases, the under $20 deals page can help you browse within a spending limit. Check the actual product price and offer details rather than relying on a discount label alone.
Finally, separate the item discount from the full order total. The formulas above calculate a pre-tax item price and do not include shipping. Any applicable taxes, delivery charges, or other checkout adjustments must be considered separately. The checkout screen determines the final amount you are being asked to pay.
Frequently asked questions
How do I calculate 20 percent off a price?
Multiply the original price by 0.20 to find the savings, then subtract that amount. For a hypothetical $50 item, 20% is $10, so the discounted price is $40. You can also multiply $50 by 0.80 to get the sale price directly.
How do I calculate 15 percent off without a calculator?
Find 10% of the price by moving the decimal point one place left, then find 5% by dividing that amount in half. Add those amounts to get 15%. For a $60 item, 10% is $6 and 5% is $3, making the discount $9 and the sale price $51.
How do I find the original price before a discount?
Divide the discounted price by the percentage you still pay, expressed as a decimal. If an item costs $60 after a 25% discount, you are paying 75% of the original price. Divide $60 by 0.75 to recover the original $80 price. This works when the discount percentage is known and is less than 100%.
What is the difference between percent off and dollars off?
Percent off is a fraction of the starting price, while dollars off is a fixed monetary reduction. A 20% discount on $50 removes $10, but a $10 discount removes the same amount regardless of the original price. Compare the final prices to understand which offer provides the larger reduction.
Is 20 percent off plus 10 percent off equal to 30 percent?
No, not when the discounts apply sequentially to the reduced price. On a $100 item, 20% off leaves $80, and another 10% off that amount leaves $72. That is a 28% effective discount. Whether two actual offers can combine depends on their terms and the checkout calculation.
Does percent off include sales tax and shipping?
The basic percent-off formula calculates the discounted item price before tax and shipping. It does not automatically reduce delivery charges or tell you the final order total. Review the checkout breakdown for any additional charges and adjustments rather than assuming the advertised discount applies to the entire order.
Does a higher discount percentage always mean a better deal?
No. A higher percentage only describes a larger reduction relative to the stated reference price. It does not prove that the final price is unusually low. Compare the actual amount you would pay, look at available price history, and consider whether the product meets your needs before deciding.
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