Percentage Calculator
Solve common percentage problems in one place.
What is P% of X?
| What is % of ? |
Result appears here.
X is what percent of Y?
| is what % of ? |
Result appears here.
Percentage increase / decrease
| From to |
Result appears here.
X is P% of what number?
| is % of what? |
Result appears here.
How it works
Percent means “per hundred”. These common cases help with everyday comparisons and changes.
Formulas
- What is X% of Y? → (X ÷ 100) × Y
- X is what % of Y? → (X ÷ Y) × 100%
- Percent change from A to B: → ((B − A) ÷ |A|) × 100%
Worked examples
15% of 200 = 30. 30 is 15% of 200. Changing from 80 to 100 is a 25% increase.
For general information only.
How to use the Percentage Calculator
It takes a few seconds, and every figure is calculated in your browser.
- Open the Percentage Calculator and pick the mode you need.
- Type your values into the fields — nothing is uploaded or stored on a server.
- Read the result panel for the headline answer and the supporting figures.
- Use Copy, CSV, Share or Print under the result if you want to keep it.
Percentage Calculator — frequently asked questions
What formula does the Percentage Calculator use?
What is X% of Y? → (X ÷ 100) × Y X is what % of Y? → (X ÷ Y) × 100% Percent change from A to B: → ((B − A) ÷ |A|) × 100%
How does the Percentage Calculator work?
Percent means “per hundred”. These common cases help with everyday comparisons and changes.
Can you walk through a worked example?
15% of 200 = 30. 30 is 15% of 200. Changing from 80 to 100 is a 25% increase.
Last updated 10 November 2026 · Formula, worked example and assumptions are documented above, and every result is calculated in your browser.