How to Calculate a Discount and Sale Price
Whether you are shopping a clearance rack or pricing products for your own store, knowing how to calculate a discount is basic math that comes up constantly. The formula takes about five seconds once you know it, and a discount calculator makes it instant for any combination of prices and percentages.
This guide covers both directions: finding the sale price from a percentage off, and finding the percentage off from two prices.
How to Calculate Percent Off
The formula has two steps. First, multiply the original price by the discount percentage and divide by 100. That gives you the amount saved. Then subtract the savings from the original price to get the sale price.
For example, 30 percent off a $120 jacket: $120 multiplied by 30 divided by 100 equals $36 saved. The sale price is $120 minus $36, which is $84.
The shortcut: multiply the original price by (1 minus the discount as a decimal). For 30 percent off: $120 multiplied by 0.70 equals $84 directly.
How to Find the Discount Percentage
Sometimes you see two prices and want to know the percentage off. The formula is: subtract the sale price from the original, divide by the original, and multiply by 100.
If a $90 item is marked down to $63: $90 minus $63 equals $27 saved. $27 divided by $90 equals 0.30. Multiply by 100, and the discount is 30 percent.
A discount calculator handles both directions — enter the original price and discount to find the sale price, or enter both prices to find the percentage off.
Stacking Discounts
When a store offers multiple discounts, such as 20 percent off plus an extra 10 percent, they do not add up to 30 percent. The second discount applies to the already-reduced price. On a $100 item: 20 percent off brings it to $80, then 10 percent off $80 brings it to $72. The total discount is 28 percent, not 30.
This is a common source of confusion and a good reason to check the final price with a calculator rather than assuming the percentages add up.
Discount Before or After Tax
Discounts are applied before sales tax. If a $100 item is 25 percent off, the sale price is $75, and tax is calculated on $75. This is standard practice in the US and most countries. Use the sales tax calculator to estimate the final after-tax price.
Common Discount Quick Reference
Knowing a few benchmarks speeds up mental math in any store. Ten percent off means you pay 90 percent of the price. Twenty-five percent off means you pay 75 percent. Fifty percent off means half price. Buy one get one free is the same as 50 percent off when you buy two.
Frequently Asked Questions
How do I calculate 25 percent off?
Multiply the price by 0.25 to get the savings, then subtract from the original. On a $60 item: $60 times 0.25 equals $15 off, sale price is $45. Or multiply $60 by 0.75 to get $45 directly.
How do I find what percentage off I am getting?
Subtract the sale price from the original price, divide by the original, and multiply by 100. A discount calculator does this instantly.
Do multiple discounts stack equally?
No. Each discount applies to the already-reduced price, so 20 percent off plus 10 percent off equals 28 percent total, not 30 percent.
Can I use this for double discounts?
Yes. Calculate the first discount to get the reduced price, then use that as the new original price for the second discount. A 20 percent off plus 10 percent off coupon on a $100 item brings it to $80 first, then $72 — a total savings of 28 percent, not 30.
How do store coupons work with a sale?
Most stores apply the sale discount first, then the coupon on the reduced price. Check the coupon’s terms — some exclude sale items. Either way, use the calculator to verify the final price before you check out.
When Are the Best Discounts
Certain times of year consistently offer the deepest discounts. In the United States, Black Friday and Cyber Monday in late November see 30 to 60 percent off at most retailers. End-of-season clearances in January and July offer deep markdowns as stores clear inventory. Amazon Prime Day in mid-July rivals Black Friday for electronics and home goods. Presidents Day and Labor Day weekends bring strong sales on furniture and appliances. Back-to-school sales in August target clothing, electronics, and supplies. Knowing when the big discount windows open means you can plan purchases around them and save significantly over buying at full price throughout the year.
Calculate Your Discount Now
Get the exact sale price, savings, or percentage off in seconds. Open the discount calculator, enter your numbers, and see the result. For more everyday math, see the tip calculator and percentage calculator.