How it works
The three modes use:
- X% of Y = (X ÷ 100) × Y
- X is what % of Y = (X ÷ Y) × 100
- Change from X to Y = ((Y − X) ÷ X) × 100
Worked example
Examples: 20% of 80 = 16 · 16 is 20% of 80 · from 80 to 100 = +25%.
Percentage Calculator
Three common percentage problems in one place — find a percent of a number, work out what percent one value is of another, or measure the percentage change between two numbers.
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Frequently asked questions
How do I turn a percentage into a decimal?
Divide by 100. So 7% becomes 0.07. To go the other way, multiply a decimal by 100 to get the percent.
What's the difference between percentage points and percent?
Going from 10% to 12% is a rise of 2 percentage points, but a 20% increase. The distinction matters a lot in finance and statistics.
How is percentage change calculated?
Subtract the old value from the new value, divide by the old value, then multiply by 100. A negative result is a decrease.