Percentage calculator
Three percentage calculations on one page. Change any number and the result updates instantly.
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How it is calculated
X % of Y = Y × X / 100
A is ? % of B = A / B × 100
% change = (new − old) / old × 100
A 10 % rise followed by a 10 % fall does not bring you back to the start: 100 → 110 → 99.
Frequently asked questions
How do I calculate 15 % of 80?
Multiply 80 by 15 and divide by 100: 12.
How do I calculate a percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100 is +25 %.
What is the difference between percent and percentage points?
If a rate goes from 10 % to 12 %, it rises 2 percentage points, which is a 20 % increase.