Percentage calculator
Find X% of a number, what percent one number is of another, percent change, and a sale price after a discount.
- ๐บ๐ธ US federal & state rules
15% of 80
12
80 + 15% = 92, 80 - 15% = 68
- Added on
- 92
- Taken off
- 68
- As a decimal
- 0.15
This is an example. Enter your numbers above and press the button to see your own result.
Other percentages of 80
| 1% | 0.8 |
|---|---|
| 5% | 4 |
| 10% | 8 |
| 15% | 12 |
| 20% | 16 |
| 25% | 20 |
| 50% | 40 |
| 75% | 60 |
Show the math
| Formula | 15 รท 100 ร 80 = 12 |
|---|
What to do next
How it works
Pick the question you are asking and enter two numbers. X% of Y is X รท 100 ร Y. "X is what percent of Y" is X รท Y ร 100. Percent change is the difference divided by the starting value.
For shopping, the sale price is the original price times (1 - discount), and the original price is the sale price divided by (1 - discount).
Things to keep in mind
Percent change depends on which number you start from. A move from 50 to 65 is +30%, but going back from 65 to 50 is about -23%.
Percentage points are not the same as percent. A rate that goes from 4% to 5% rose by 1 percentage point, which is a 25% increase in the rate.
Frequently asked questions
How do I find a percentage of a number?
Divide the percent by 100 and multiply. 15% of 80 is 0.15 ร 80, which is 12.
How do I calculate percent change?
Subtract the old value from the new one, divide by the old value, and multiply by 100. Going from 50 to 65 is a 30% increase.
How do I work out a sale price?
Multiply the price by one minus the discount. A $79.99 item at 25% off costs $79.99 ร 0.75, which is $59.99.
Is 20% off and then 10% off the same as 30% off?
No. The second discount applies to the already reduced price, so you pay 80% ร 90% = 72% of the original, which is 28% off.