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Calculate a Discount and Sale Price
The Tools Kit’s free Discount Calculator shows the sale price, how much you save, and the total percent off for any percentage discount. Enter the original price and the percent off, add an optional second “extra % off” coupon, and the results update as you type. It works as a sale price calculator, a percent off calculator, and a quick way to answer “how much will I save?” before you check out.
Sale price = original price × (1 − discount ÷ 100). Savings = original price − sale price. At 30% off, an $80 item costs $56 and you save $24.
How to Use the Discount Calculator
- 1
Enter the original price
Type the full, pre-sale price of the item into the Original Price field.
- 2
Enter the discount percentage
Type the percent off being offered, for example 25 for a 25% off sale.
- 3
Add a stacked discount (optional)
If an extra coupon or "take an additional 10% off" offer applies on top of the sale, enter it in the Additional Stacked Discount field. Leave it blank for a single discount.
- 4
Read the results
The Sale Price, You Save amount and Total % Off update instantly as you type, with no calculate button to press.
Results appear once both the price and the discount are filled in. A negative price, or a discount below 0% or above 100%, shows an error instead of a result. Everything is calculated in your browser, with no account and no limit on how many prices you check.
How to Calculate Percent Off by Hand
A discount is a percentage of the original price, so the math is the same as any “X% of Y” problem. First find the savings by multiplying the price by the discount and dividing by 100, then subtract the savings from the price. The shortcut is to multiply by the part you still pay: 25% off means you pay 75%, so multiply by 0.75.
- 10% off $50: $50 × 0.90 = $45, saving $5.
- 25% off $120: $120 × 0.75 = $90, saving $30.
- 30% off $80: $80 × 0.70 = $56, saving $24.
- 50% off $64: $64 × 0.50 = $32, saving $32.
To work out what percentage a discount is when you only know the two prices, divide the difference by the original price: a $40 item marked down to $30 is $10 ÷ $40 = 25% off. For other percentage questions, such as percentage increase or “what percent of” one number is of another, use the percentage calculator.
Stacked Discounts: Why 20% + 10% Is Not 30% Off
Retailers often advertise “an extra 10% off sale prices” or let a coupon stack on top of a markdown. The second discount is taken from the already-reduced price, so the two percentages multiply rather than add. The calculator applies the stacked discount the same way, and the Total % Off card shows the true combined rate.
- $100 at 20% + 10%: $100 → $80 → $72. You save $28, which is 28.0% off, not 30%.
- $250 at 40% + 15%: $250 → $150 → $127.50. You save $122.50, which is 49.0% off, not 55%.
The general rule is combined discount = 1 − (1 − first) × (1 − second). Order does not matter: 10% then 20% gives the same $72 as 20% then 10%. What does matter is comparing offers correctly: a single 30% off deal beats 20% plus an extra 10%.
Discounts, Sales Tax, and the Real Checkout Price
This calculator gives the price before tax. In most US states sales tax is charged on the discounted price, so after finding the sale price you can add tax with the sales tax calculator, or with the VAT calculator if you are shopping in a country where prices carry VAT. Coupons and rebates can be treated differently for tax depending on the state, so check your receipt when the difference matters.
Shopping from an overseas store? Run the discount here first, then convert the sale price with the currency converter. If you sell rather than buy, the same percent-off math applies when you offer a customer discount on an invoice, and the invoice generator can apply a percentage discount to an invoice for you.
Common uses
- Checking the real price of a Black Friday, holiday or clearance sale item
- Working out whether an “extra % off” coupon on top of a sale is worth it
- Comparing two stores that offer different percent-off deals on the same product
- Setting sale prices for a shop or online listing from a target discount
- Budgeting for a large purchase on sale, alongside a credit card payoff calculator if you plan to pay for it over time
For other everyday money math, such as splitting a restaurant bill with the tip calculator, browse the full set of free calculators.
Discount calculator terms explained
| Term | What it means here |
|---|---|
| Original price | The full list or tag price before any discount is taken off |
| Discount percentage | The share of the price taken off, such as 25% off |
| Sale price | What you pay after the discount: original price minus the savings |
| Savings (You Save) | The dollar amount the discount removes from the original price |
| Stacked discount | A second percentage applied to the already-reduced price, not to the original price |
| Total % Off | The effective combined discount: savings divided by the original price, times 100 |
Frequently Asked Questions
Multiply the original price by the discount percentage and divide by 100 to get the savings, then subtract the savings from the price. For 30% off $80, the savings are $80 × 30 ÷ 100 = $24, so the sale price is $56.
Multiply the original price by what is left after the discount: sale price = price × (1 − discount ÷ 100). For 30% off $80, that is $80 × 0.70 = $56. The calculator shows this as Sale Price.
Savings = original price × discount ÷ 100. A 25% discount on a $120 item saves $30, bringing the price to $90. The calculator shows the dollar savings in the You Save card.
A stacked discount is applied to the price after the first discount, not to the original price. On a $100 item with 20% off and then an extra 10% off, the first discount brings it to $80 and the extra 10% takes off $8 more, for a final price of $72.
No. Stacked discounts multiply rather than add. 20% off followed by 10% off works out to 28% off in total, because the second discount is taken from the reduced price. On a $100 item you pay $72, not $70.
Total % Off is the effective combined discount: your total savings divided by the original price, times 100, shown to one decimal place. With a single discount it equals that discount; with a stacked discount it is always less than the two percentages added together.
No. It has no tax field, so the Sale Price is the price before tax. To add tax, take the sale price into a sales tax or VAT calculator, since sales tax is normally charged on the discounted price.
No. Both discount fields take a percentage. For a flat discount such as $15 off, simply subtract it from the price, or divide it by the original price and multiply by 100 to convert it to a percentage first.
Divide the sale price by what remains after the discount: original = sale price ÷ (1 − discount ÷ 100). An item selling for $60 after 25% off had an original price of $60 ÷ 0.75 = $80. The calculator works forward from the original price, so use this formula for the reverse.
Results are formatted with a dollar sign and two decimal places. The percentage math is the same in any currency, so you can enter a price in pounds, euros or rupees and read the result in that currency.
It is free, needs no signup, and has no usage limit. The calculation runs entirely in your browser, so the prices you type are not sent to a server.
Reviewed by Raja Jahangir · Last reviewed: October 1, 2026
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How do you calculate a discount?
To calculate a discount, multiply the original price by the discount percentage and subtract it: 30% off $80 is $80 − $24 = $56. A quicker route is to multiply by the remaining fraction directly - $80 × 0.70 = $56 - which avoids the subtraction step entirely.