Percentage Calculator

Three clearly-labelled modes for the percentage maths students need most. Pick a mode, enter the values, and see the answer with the calculation shown.

Calculation mode

Example: 15% of 240 = 36.

How each mode works

Percentage of a number

Multiply the number by the percentage divided by 100. For example, 15% of 240 = (15 ÷ 100) × 240 = 36.

What percentage one value is of another

Divide the value by the total and multiply by 100. For example, 45 ÷ 180 × 100 = 25%.

Percentage increase or decrease

Subtract the original from the new value, divide by the original, and multiply by 100. For example, from 50 to 65: (65 − 50) ÷ 50 × 100 = 30% increase. A negative result is a decrease.

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