Percentage calculator
Three calculators in one. Fill in any line and the answer appears instantly.
What is % of ?
is what percent of ?
Percentage change from to
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How to calculate a percentage of a number
Multiply the number by the percentage and divide by 100. 25% of 80 = 80 × 25 ÷ 100 = 20.
How to find what percent one number is of another
Divide the part by the whole and multiply by 100. 30 out of 120 = 30 ÷ 120 × 100 = 25%.
How to calculate percentage change
Subtract the old value from the new value, divide by the old value and multiply by 100. From 50 to 65: (65 − 50) ÷ 50 × 100 = 30% increase. A negative result is a decrease.
Note that percentage changes are not symmetric: going from 100 to 80 is a 20% decrease, but going from 80 back to 100 is a 25% increase.
Frequently asked questions
How do I calculate 20% of a number?
Multiply the number by 0.2. For example, 20% of 150 is 30.
How do I calculate a percentage increase?
Divide the difference between the new and old values by the old value, then multiply by 100.
What is the difference between percent and percentage points?
Percentage points measure the simple difference between two percentages. A rate going from 4% to 5% rises by 1 percentage point, which is a 25% increase.