Free Online Percentage Calculator

How to use Percentage Calculator

1. Choose the percentage question you want to answer.
2. Enter A and B as labeled in that question; decimals and negative values are accepted.
3. Calculate to see the result and formula.

What this tool does

Calculate a percentage of a number, one value as a percentage of another, or percentage increase and decrease with clear formulas.

Your input is processed in your browser and is not uploaded by this tool.

Percentage of a number uses A divided by 100 and multiplied by B. A as a percentage of B divides A by B and multiplies by 100. Percentage change divides the difference between B and A by the absolute value of A, then multiplies by 100; this absolute-baseline convention keeps the direction explicit when A is negative.

Before you start

• No account is required to open the tool.
• Check the supported input formats and limits on the tool page.
• Review generated or estimated results before relying on them.