Use our free Percentage Calculator to quickly work out a percentage of a number, find out what percentage one number is of another, or calculate the percentage increase or decrease between two values. Simply enter your numbers, choose the calculation you need and get an instant result.

Our Percentage Calculator gives you three simple ways to work with percentages.

Percentage of a Number
Enter a percentage and a number to find the result. For example, find out what 20% of 500 is.

Percentage Between Two Numbers
Enter two values to find out what percentage the first number is of the second. For example, 50 is 25% of 200.

Percentage Change
Enter an original value and a new value to calculate the percentage change between them. The calculator will show whether the change is an increase or decrease.

Simply choose the calculation you need, enter your values and click Calculate.

Finding a percentage of a number
If you want to find 15% of 240, enter 15 as the percentage and 240 as the number. Your result is 36.

Finding what percentage one number is of another
To find out what percentage 30 is of 120, enter 30 and 120. The result is 25%.

Calculating a percentage increase
If a value increases from 80 to 100, the difference is 20. The calculator shows this as a 25% increase.

Calculating a percentage decrease
If a value falls from 500 to 400, the calculator shows a 20% decrease.

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A percentage increase or decrease shows how much a value has changed in relation to its original value.

For example, if a price increases from £100 to £120, the increase is £20. However, the percentage increase is 20%, because the £20 change is measured against the original £100.

The same principle applies to decreases. If a value falls from £100 to £80, the £20 reduction represents a 20% decrease.

One important thing to remember is that percentage increases and decreases are based on the original value, so increasing and then decreasing by the same percentage will not necessarily return you to the starting amount.