Discount Calculator
The price after a discount, with an extra percent off and sales tax, the percent off between two prices, or the original price.
Your price
Filled in with example values. Replace them with your own.
Optional
A second discount taken off the already reduced price, e.g. an extra 10% at the till.
Added to the sale price at the rate you enter.
Currency symbol
Results update as you type.
Result
Original $80.00, 25% off: sale price $60.00, you save $20.00
Sale price
$60.00
- Original price
- $80.00
- You save25% in total
- $20.00
The original price
- You pay
- $60.00
- You save
- $20.00
- Original price
- $80.00
How it’s calculated
First discount
$80.00 × 25% = − $20.00
Sale price
$80.00 − $20.00 = $60.00
How the discount calculator works
Pick the question you have. The calculator finds the price after a discount, the percent off between two prices, or the original price from a sale price and the percent off.
For a sale price you can add a second discount, such as an extra 10% at the till, and sales tax at the rate you enter. Each discount and the tax are rounded to the cent.
The formula
Sale price = Original × (1 − Discount)
Percent off = (Original − Sale) ÷ Original
Original = Sale ÷ (1 − Discount)
Worked examples
- 80 with 25% off: 80 × 25% = 20 off, so you pay 60.
- With an extra 10% off: 60 × 10% = 6 more, so the price is 54, 32.5% off in total. With 8.25% sales tax you pay 54 + 4.46 = 58.46.
- From 120 down to 90: 30 ÷ 120 = 25% off.
- 59.99 after 40% off: 59.99 ÷ 0.6 = 99.983, so the original price was about 99.98.
Assumptions and limitations
- Discounts and tax are rounded to the nearest cent, half up. A shop’s till may round differently by a cent.
- Tax is added to the discounted price at the rate you enter; no rate is assumed.
- Coupons with conditions (minimum spend, buy one get one) are not modelled.
Frequently asked questions
Is 25% off and then 10% off the same as 35% off?
No. The second discount is taken from the already reduced price, so it is worth less. 25% off and then 10% off is 32.5% off the original price in total.
Is the discount taken before or after sales tax?
In most shops, sales tax is worked out on the price after the discount, which is how this calculator adds it. Where prices already include tax (as with VAT in many countries), leave the tax off.
Why does the original price come out slightly off?
Shops round sale prices to the cent, so working backwards from a sale price can land a fraction of a cent away. The exact figure is shown in the steps before it is rounded.
Can I enter a discount as an amount?
Yes. Switch the discount to Amount for offers like “10 off”, and the calculator shows what percentage that is.