Percentage Calculator

Calculate percentages quickly and accurately. This tool helps you find a percentage of a value or determine the original number from a percentage result.

Calculation result

The calculated percentage result is displayed below.

What is a percentage?

A percentage represents a proportion out of 100. It is commonly used to compare values, calculate discounts, measure growth or analyze data. For example, 25% means 25 out of 100.

How to calculate a percentage

To calculate a percentage of a value, multiply the value by the percentage and divide by 100.

Example: 20% of 150 = (150 × 20) ÷ 100 = 30

Reverse percentage calculation

Sometimes you know the percentage result but not the original value. In this case, divide the result by the percentage and multiply by 100.

Example: 30 is 20% of what? → (30 × 100) ÷ 20 = 150

Common uses of percentage calculations

Calculating discounts during sales or promotions.
Finding tax amounts such as VAT or sales tax.
Measuring increases or decreases in prices or salaries.
Analyzing statistics, results or performance indicators.

Common mistakes to avoid

Forgetting to divide by 100 when applying a percentage.
Mixing up the base value and the percentage value.
Using the wrong formula for reverse calculations.

Did you know?

The word “percentage” comes from the Latin phrase “per centum”, which means “by the hundred”.