This discount calculator shows the sale price and how much you save when an item is marked down by a percentage or a dollar amount. It also handles stacked discounts, such as “20% off plus an extra 10%”, and adds sales tax if you need the final checkout price. To find what percent off a sale price is, use the second calculator.
Discount Calculator
What Percent Off Is It?
How to Calculate a Discount
Savings = Original price × Discount % ÷ 100Sale price = Original price − Savings
A quicker way is to multiply by the percentage you still pay. With 20% off you pay 80%, so the sale price is the original × 0.80.
Example: a $65 jacket at 30% off. Savings = 65 × 0.30 = $19.50. Sale price = 65 × 0.70 = $45.50.
Stacked Discounts: 20% + 10% Is Not 30%
When a store offers “an extra 10% off sale prices”, the second discount applies to the already reduced price, not the original. On a $100 item:
- 20% off: $100 → $80
- Extra 10% off: $80 → $72
The total discount is 28%, not 30%. The order of two percentage discounts does not change the result. With a dollar coupon, the order does matter: on a $100 item, a $10 coupon applied after 20% off gives $70, but applied before it gives $72. The calculator applies the discounts in the order you enter them.
How to Find the Percent Off
Percent off = (Original price − Sale price) ÷ Original price × 100
Example: a pair of shoes is reduced from $80 to $60. (80 − 60) ÷ 80 × 100 = 25% off.
Quick Discount Table
| Original price | 10% off | 20% off | 25% off | 30% off | 50% off |
|---|---|---|---|---|---|
| $20 | $18 | $16 | $15 | $14 | $10 |
| $50 | $45 | $40 | $37.50 | $35 | $25 |
| $80 | $72 | $64 | $60 | $56 | $40 |
| $100 | $90 | $80 | $75 | $70 | $50 |
| $250 | $225 | $200 | $187.50 | $175 | $125 |
| $500 | $450 | $400 | $375 | $350 | $250 |
Sales Tax and Discounts
In the US, sales tax is normally charged on the price after the discount. For an $80 sale price with 8% sales tax, the tax is $6.40 and the total is $86.40. Enter your local tax rate in the calculator to see the checkout total.
Watch for “up to 70% off” signs: the headline discount usually applies to only a few items. Comparing the final price, not the percentage, is the safest way to judge a deal.
Frequently Asked Questions
How do I calculate 20% off a price?
Multiply the price by 0.80. For example, 20% off $45 is 45 × 0.80 = $36, which saves you $9.
Is 20% off plus an extra 10% off the same as 30% off?
No. The extra 10% is taken from the already reduced price, so the total discount is 28%. On $100 you pay $72, not $70.
How do I work out what percent off something is?
Subtract the sale price from the original price, divide by the original price, and multiply by 100. From $80 to $60 is 25% off.
Is sales tax calculated before or after a discount?
Usually after. Store discounts reduce the price before tax is added. Manufacturer coupons can be treated differently in some US states.