Discount Calculator
Find the sale price and savings for any percent off, stack a second discount, add sales tax, or work backwards from a sale price to the percentage off.
Discount Calculator: with the default inputs, result is $60.00.
Used in 'sale price' mode.
Used in 'percent off' mode.
- Final price
- $60.00
- You save
- $20.00
- Total discount
- 25%Overall percent off the original price.
- Sales tax
- $0.00
- Final price with tax
- $60.00
Assumptions
- A second discount applies to the already-discounted price.
- Sales tax is applied to the final discounted price.
| Percent off | You save | Sale price |
|---|---|---|
| 10% | $8.00 | $72.00 |
| 15% | $12.00 | $68.00 |
| 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 |
| 60% | $48.00 | $32.00 |
| 70% | $56.00 | $24.00 |
| 75% | $60.00 | $20.00 |
How this is worked out
The formula
sale price = original × (1 − discount%) you save = original − sale price stacked: final = original × (1 − d₁) × (1 − d₂); total discount = 1 − (1 − d₁)(1 − d₂) percent off = (original − sale) ÷ original × 100
Open How it’s calculated above to see this worked through with your own numbers.
What you enter
- What do you want to find?
- Choose one of 2 options.Sale price from a percent off · Percent off from original and sale price
- Original price
- A number.in dollars · 0 or more · defaults to 80
- Discount
- Used in 'sale price' mode.a percentage · from 0 to 100 · defaults to 25
- Sale price
- Used in 'percent off' mode.in dollars · 0 or more · defaults to 60
- Extra discount on the sale price(under More options)
- 'Extra 20% off already-reduced items' applies to the sale price, not the original.a percentage · from 0 to 100 · defaults to 0
- Sales tax(under More options)
- Applied after all discounts.a percentage · from 0 to 50 · defaults to 0
What you get back
- Resultmain answer
- Final price
- You save
- Total discount
- Overall percent off the original price.
- Sales tax
- Final price with tax
What this assumes
- A second discount applies to the already-discounted price.
- Sales tax is applied to the final discounted price.
About this calculator
Type the original price and the percent off to get the sale price and the amount saved. Switch modes to work backwards — you know the old and new price and want the percentage. Open More options to stack a second discount ("extra 20% off clearance") and to add sales tax so the number matches the register.
Stacked discounts don't add
"40% off, plus an extra 20% off at checkout" is not 60% off. The second discount is taken from the already-reduced price: 0.60 × 0.80 = 0.48, so you pay 48% and save 52%. Retailers know most shoppers add the percentages; the calculator shows the true combined rate.
Reading the results
- Final price is what you pay before tax; with tax adds sales tax on the discounted amount (in the US, tax is charged on the price actually paid, after coupons and markdowns, in almost every state).
- You save is the difference from the original price.
- Total discount is the real percent off, useful when discounts are stacked.
Mental math
Ten percent is the decimal point moved one place left. From there: 20% is double it, 5% is half, 15% is both added, 25% is a quarter (divide by 4), 33% is a third, and 50% is half. For 30% off $80: 10% is $8, so 30% is $24 and the price is $56.
Is the discount real?
Compare the sale price with the item's usual price, not the "list" or "was" price, which is often inflated ahead of a sale. Price-tracking sites keep histories for large retailers. A "percent off" on a marked-up anchor price can leave you paying more than last month's everyday price.
Reverse mode
Enter the original and sale price to find the percent off. This is also handy for checking that a receipt applied a coupon correctly, or for turning "was $120, now $89.99" into "25% off" when comparing offers across shops.
Frequently asked questions
▸How do I calculate 20% off a price?
Multiply the price by 0.20 to get the discount, or by 0.80 to get the sale price directly. 20% off $80 is $16 off, so $64.
▸How do I figure out what percent off something is?
Subtract the sale price from the original, divide by the original, and multiply by 100. $120 down to $90 is $30 ÷ $120 = 25% off.
▸Does 30% off plus 20% off equal 50% off?
No — 44%. The second discount applies to the already-reduced price: 0.70 × 0.80 = 0.56, so you pay 56% of the original.
▸Is sales tax charged before or after the discount?
In the US, tax is generally charged on the price you actually pay after store discounts and coupons. Manufacturer coupons are treated differently in some states, where tax applies to the pre-coupon price.
▸How do I find the original price from a sale price?
Divide the sale price by (1 − discount). If $60 is 25% off, the original was $60 ÷ 0.75 = $80. Use Solve for → Original price with the final price as the target.
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