Percentage Calculator
Three quick calculators — results update as you type.
What is X% of Y?
% of
=
16
X is what percent of Y?
is
20%
of
Percentage increase / decrease
From
to
=
How to calculate percentages
A percentage expresses a number as a fraction of 100. The three calculators above cover the everyday cases:
- Percent of a number: multiply the value by the percentage and divide by 100.
20% of 80 = 80 × 20 ÷ 100 = 16. - What percent: divide the part by the whole and multiply by 100.
16 ÷ 80 × 100 = 20%. - Percentage change: subtract the old value from the new, divide by the old value, multiply by 100.
(100 − 80) ÷ 80 × 100 = 25%.
Percentage FAQ
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 80 is 80 × 20 ÷ 100 = 16.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100.
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