Percentage Calculator
Work out a percentage of any amount, plus the value increased or decreased by that percentage.
Result
Percentage of amount
20.00
Amount increased by %
120.00
Amount decreased by %
80.00
How it works
Result = Amount × Percentage ÷ 100
A percentage expresses a number as a fraction of 100. This tool also shows the amount after adding or subtracting the percentage — handy for markups, discounts and tax.
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Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage, then divide by 100. For example, 20% of 150 is (150 × 20) ÷ 100 = 30.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 out of 150 is (30 ÷ 150) × 100 = 20%.
How do I calculate a percentage increase or decrease?
Subtract the old value from the new one, divide by the old value, then multiply by 100. A rise from 80 to 100 is a 25% increase.