Discount Calculator – Sale Price, Percent Off and Savings
Enter a price and a discount to see the sale price and how much you save. Stack an extra percent off, add sales tax, or find the percent off between an original and a sale price.
Sale price = original price × (1 − discount ÷ 100). Example: $80 with 25% off → $80 × 0.75 = $60, so you save $20. To find the percent off between two prices: (original − sale) ÷ original × 100. $50 → $35 is 15 ÷ 50 = 30% off.
How to use the Discount Calculator
- Enter the original price.
- Choose Percent off or Amount off and enter the discount.
- Optional: add an extra discount (for example a coupon on top of a sale) and your sales tax rate.
- Read the final price, the amount saved and the total discount. The quick table shows 10% to 70% off at a glance.
- Use the % off between two prices tab when you know both prices.
How to calculate percent off in your head
- 10% off: move the decimal point one place left. 10% of $45 is $4.50.
- 20% off: double the 10%. 20% of $45 is $9, so you pay $36.
- 25% off: divide by 4. 25% of $60 is $15.
- 50% off: halve the price.
- 15% off: 10% plus half of 10%. 15% of $40 is $4 + $2 = $6.
Stacked discounts are not added
A sale of 20% off plus an extra 10% coupon is not 30% off. The second discount applies to the already reduced price: $100 → $80 → $72. The total discount is 28%, because 0.8 × 0.9 = 0.72. The calculator shows this effective discount for you.
Discount table
| Price | 20% off | 30% off | 40% off | 50% off |
|---|---|---|---|---|
| $25 | $20.00 | $17.50 | $15.00 | $12.50 |
| $50 | $40.00 | $35.00 | $30.00 | $25.00 |
| $80 | $64.00 | $56.00 | $48.00 | $40.00 |
| $120 | $96.00 | $84.00 | $72.00 | $60.00 |
| $200 | $160.00 | $140.00 | $120.00 | $100.00 |
Working backwards to the original price
To find the price before a discount, divide the sale price by (1 − discount). A jacket that costs $42 after 30% off was $42 ÷ 0.7 = $60. Adding 30% back to $42 gives $54.60, which is wrong, because the 30% was taken from the larger original price.
Discounts and sales tax
In the US, sales tax is added at the register, and for a store discount it is normally charged on the reduced price. A $80 item at 25% off with 8% sales tax costs $60 × 1.08 = $64.80. Canada works the same way. In the UK, Australia, New Zealand and India, shelf prices already include VAT or GST, so leave the tax box empty.
Related tools: Percentage Calculator, VAT Calculator and Tip Calculator.
Frequently asked questions
How do I calculate 20% off a price?
Multiply the price by 0.8. $65 × 0.8 = $52, so you save $13.
How do I find the discount percentage?
Subtract the sale price from the original, divide by the original and multiply by 100. $120 → $90: 30 ÷ 120 = 25% off.
Is 20% off and then 20% off the same as 40% off?
No. It is 36% off, because 0.8 × 0.8 = 0.64 of the original price.
How do I find the original price before a discount?
Divide the sale price by (1 − discount). A $42 price after 30% off was $42 ÷ 0.7 = $60.
Is sales tax calculated before or after a discount?
For store discounts and coupons, usually after: you pay tax on the reduced price. Rules for manufacturer coupons vary by state.
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