Percentage calculator
Find a percentage of a number, a part as a percent, the original whole, or a value after adding or subtracting a percentage.
Ready when you are.
Inputs stay in your browser. Results use the displayed formula and are rounded only for display.
How to use this tool
- Choose the question you want to solve.
- Enter A and B in the order shown in the operation.
- Calculate and review the result and formula.
Frequently asked questions
Which formulas are used?
A% of B = A × B ÷ 100. A as a percent of B = A ÷ B × 100. The whole = A × 100 ÷ B.
Can I enter decimals?
Yes. Decimal and negative numbers are accepted. A denominator of zero has no defined result.
How do I undo a percentage increase?
Use “A is B% of what whole?” with A as the final value and B as 100 plus the increase percentage.