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40
20% off 50 is 40, saving 10
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The percent off formula
Sale price = original price − (percent off ÷ 100 × original price)
How to calculate percent off
- 1.Divide the discount by 100 to turn it into a decimal. 20% becomes 0.2.
- 2.Multiply that by the original price. This is what you save.
- 3.Subtract the saving from the original price to get what you pay.
Worked example
A $50 shirt is 20% off. What do you pay?
- 20 ÷ 100 = 0.2
- 0.2 × 50 = 10 saved
- 50 − 10 = 40
You pay $40 and save $10.
Common discounts on a $100 price
Scale these for your own price. On $50, halve each figure. On $200, double it.
| Discount | You save | You pay |
|---|---|---|
| 5% off | $5.00 | $95.00 |
| 10% off | $10.00 | $90.00 |
| 15% off | $15.00 | $85.00 |
| 20% off | $20.00 | $80.00 |
| 25% off | $25.00 | $75.00 |
| 30% off | $30.00 | $70.00 |
| 40% off | $40.00 | $60.00 |
| 50% off | $50.00 | $50.00 |
| 60% off | $60.00 | $40.00 |
| 70% off | $70.00 | $30.00 |
| 75% off | $75.00 | $25.00 |
| 80% off | $80.00 | $20.00 |
Doing it in your head
Take 10% by moving the decimal point one place left, so 10% of $80 is $8. Every other common discount is built from that: 20% is double it, 5% is half it, and 25% is a quarter off, which is the price divided by four. A shortcut worth having in a shop.
Common questions
How do you calculate percent off?
Multiply the price by the discount as a decimal to get the saving, then subtract it. 20% off $50 is $10 off, so you pay $40.
How much is 20 percent off?
It depends on the price. 20% off means you pay 80% of it, so multiply the price by 0.8. On $50 that is $40.
How do I work out two discounts together?
Apply them one after the other, not added together. 20% off then a further 10% off is not 30% off. On $100 it is $80, then $72, so the real discount is 28%.
Is percent off the same as percentage decrease?
Yes. A price cut by 25% has decreased by 25%. Percent off is the everyday name for it on a price tag.
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The percent off formula
Sale price = original price − (percent off ÷ 100 × original price)
How to calculate percent off
Divide the discount by 100 to turn it into a decimal. 20% becomes 0.2. Multiply that by the original price. This is what you save. Subtract the saving from the original price to get what you pay.
Doing it in your head
Take 10% by moving the decimal point one place left, so 10% of $80 is $8. Every other common discount is built from that: 20% is double it, 5% is half it, and 25% is a quarter off, which is the price divided by four. A shortcut worth having in a shop.
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