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Discount Calculator

Calculators

Find the sale price, the discount percentage or the original price, including stacked discounts.

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Quick answer

What is the sale price of an item that costs $80 with 25% off?

The sale price is $60.00 and you save $20.00. To get it, multiply the price by 0.75 (that is 100% minus 25%).

Sale price of a $80 item
DiscountYou saveSale price
10%$8.00$72.00
20%$16.00$64.00
25%$20.00$60.00
30%$24.00$56.00
40%$32.00$48.00
50%$40.00$40.00
Formula:
Sale price = original price × (1 − discount ÷ 100). Savings = original price − sale price.
Assumptions:
A single percentage discount with no sales tax added. The calculator also handles two stacked discounts and tax.

These figures are computed with the same formulas as the Discount Calculator above. Change the inputs in the tool to see your own result.

What Discount Calculator does

The Discount Calculator tells you the sale price and how much you save after a percentage discount, and can also work backwards. Enter an extra "second" discount to see the real total for stacked offers like 20% off plus an extra 10%, and add sales tax to see what you will actually pay at the till. Switch modes to find the discount percentage from two prices, or the original price from a sale price and its discount.

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Features and benefits

  • Sale price, saving and total with tax in one view
  • Stacked-discount mode that shows the true combined percentage
  • Reverse modes for discount % and original price
  • Free, no sign-up, works on any currency

How to use Discount Calculator

  1. Choose what you want to find: the sale price, the discount percentage or the original price
  2. Enter the prices and the discount percentage
  3. For a stacked offer, put the second percentage in the extra discount box, and add sales tax if you want the total you will pay
  4. Read the result and the step-by-step working

Who should use it

Made for everyone. Typical uses:

  • Checking what a store's percentage-off sale really costs
  • Seeing the true saving of stacked offers such as 20% off then 10% off
  • Working out the discount percentage from a crossed-out price and a sale price
  • Finding the original price of an item when only the sale price is shown

Example

A $150 item at 20% off costs $120 and saves $30. Two stacked discounts of 20% then 10% on $100 leave $72, which is 28% off in total, not 30%, because the second discount applies to the reduced price. A $200 item at 25% off with 8% sales tax comes to $150 plus $12 tax, or $162. A price that drops from $80 to $60 is 25% off, and a sale price of $60 that is already 25% off started at $80.

Limitations and accuracy

Stacked discounts are applied one after the other, which is how most retailers do it. Some coupons instead apply to the full price or exclude sale items; check the terms of your offer. Sales tax is added after the discounts, which is the usual rule but not universal.

Accuracy: Formulas follow standard published methods and are checked against worked reference examples. Results are estimates based on the values you enter and do not replace advice from a qualified professional.

Expert Tip

Two discounts never add up to their sum. Twenty percent off followed by ten percent off is 28% off, so a single 30% off coupon is always the better deal.

Frequently asked questions

How do I calculate a discount?
Multiply the original price by the discount percentage divided by 100 to get the saving, then subtract it from the price. 20% off $150 is 150 × 0.20 = $30 off, so the price is $120.
How do I find the discount percentage from two prices?
Subtract the sale price from the original price, divide by the original price and multiply by 100. (80 − 60) ÷ 80 × 100 = 25% off.
How do I find the original price from the sale price?
Divide the sale price by (1 − the discount as a decimal). A $60 sale price at 25% off is 60 ÷ 0.75 = $80.
How do stacked discounts work?
Each discount applies to the price left after the previous one, so 20% then 10% is 0.8 × 0.9 = 0.72 of the original: 28% off, not 30%.
Is sales tax charged before or after the discount?
In most places tax is charged on the discounted price, which is what this calculator does when you enter a tax rate. Some manufacturer coupons are taxed on the full price, so check your receipt.

Discount Calculator: the complete guide

How a percentage discount works

A discount takes a percentage off the original price. The saving is the price multiplied by the discount divided by 100, and the sale price is the price minus the saving. A $150 item at 20 percent off saves $30 and costs $120. Equivalently, you pay 80 percent of the price, so multiplying by 0.80 gives the sale price in one step.

The calculator has three modes for the three questions shoppers ask: what will I pay after this discount, what discount am I getting from these two prices, and what was the original price before this sale.

Stacked discounts do not add up

Stores often advertise "20 percent off plus an extra 10 percent". The second discount applies to the already reduced price, so the total is not 30 percent. On a $100 item, 20 percent off gives $80, and 10 percent off that gives $72. The combined discount is 28 percent, calculated as 1 − (0.80 × 0.90). The longer the stack, the more the sum overstates the real saving.

This also means order does not matter, but comparing offers does. A single 30 percent coupon ($70) beats 20 percent then 10 percent ($72), even though both sound similar. Put both discounts in the calculator to see the exact final price and the true total percentage.

Finding the discount from two prices

Sometimes a shop shows a crossed-out price and a sale price without saying the percentage. Subtract the sale price from the original, divide by the original and multiply by 100. If a jacket falls from $80 to $60, the discount is (80 − 60) ÷ 80 = 25 percent. Use the "Find the discount %" mode to check that a "sale" is as good as it looks; it also shows a price increase if the sale price is higher.

Be cautious of reference prices that were never really charged. A sale is only a saving if the original price was a genuine price. Comparing the sale price with what other retailers charge is a better test than the percentage on the label.

Finding the original price

The reverse question is common in accounting and when comparing offers: the price is $60 after 25 percent off, so what was it before? Divide the sale price by (1 − the discount as a decimal): 60 ÷ 0.75 = $80. Avoid the tempting shortcut of adding 25 percent to $60, which gives $75 and is wrong, because 25 percent was taken off the larger, original amount.

The same maths applies to prices after tax or after a fee: divide by (1 + rate), not subtract the rate. The Sales Tax Calculator and Percentage Calculator handle those cases directly.

Add sales tax to see what you pay

The price on the shelf is not always the price at the till. Enter your local sales tax to see the total after tax. Tax is usually charged on the discounted price, so a $200 item at 25 percent off is $150, and 8 percent tax adds $12 for a total of $162. Some manufacturer coupons are treated differently and taxed on the full price, so check the rules that apply. If several items are involved, calculate each one or the total, but apply the same steps in the same order.

  • Compare unit prices, not just discounts: a bigger pack at a smaller discount can still be cheaper per unit.
  • Set a budget before a sale so that a discount does not turn into extra spending.
  • Check the return policy on sale items, which is often stricter.
  • Remember shipping: a free-shipping threshold can push you to buy more than you need.

For sellers: what a discount costs you

Every discount reduces profit by more than it seems. A product with a 40 percent margin sold at 20 percent off has a margin of only 25 percent, so you must sell many more units to earn the same profit. Before you run a promotion, check the margin at the sale price with the Profit Margin Calculator and see how many extra sales you need to break even. Move the money you save on a sale into a goal with the Savings Goal Calculator. Everything on this page is calculated in your browser and nothing is stored or sent.

Learning resources

Explore more in Calculators, read the guides and articles, or see how we test our tools.

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