Free Percentage Calculator
The Percentage Calculator handles the most common percentage problems in one place: what is X% of Y, what percent is X of Y, and percentage increase or decrease between two values.
How to use the Percentage
- 1 Choose the type of percentage question you have — a percentage of a number, what percentage one number is of another, or a percentage change.
- 2 Enter the two values in the fields that appear.
- 3 Read the answer, which is shown alongside the formula used so you can check the reasoning.
- 4 Switch modes freely; each keeps its own inputs so you can compare results.
How to Use
Pick a mode, enter your numbers, and the answer updates live. Each calculator explains the formula it uses.
- X% of a number
- What percent is X of Y
- Percentage increase / decrease
Frequently asked questions
How do I calculate a percentage increase?
Divide the difference by the original value and multiply by 100. Going from 80 to 100 is a rise of 20, and 20 ÷ 80 × 100 = 25%. Note the answer depends on which value is the starting point.
Why is a 10% rise then a 10% fall not back to the start?
Because the two percentages apply to different bases. 100 rising 10% gives 110, and 110 falling 10% gives 99 — a net loss of 1%. This trips people up constantly in finance and pricing.
What is the difference between percentage points and percent?
If a rate moves from 4% to 6%, that is a rise of 2 percentage points but a 50% increase. Confusing the two is a classic error in reporting statistics.
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