Free math tool

Percentage Calculator

Calculate percent of a number, percentage change, and what percent one number is of another.

  • Percent of a number
  • Percentage change
  • Percent comparison
  • Instant results

Percent math

Calculate percentages

What is X% of Y?

X is what percent of Y?

Percentage change

Results update instantly. Empty or invalid values are treated as zero where possible.

Results

Percentage answers

20% of 150 is 30
Percent of number
30
Part as percent
20%
Percentage change
25% increase
Difference
25
Percent difference
22.22%

How to calculate percent of a number

To find a percent of a number, divide the percent by 100 and multiply by the number. For example, 20% of 150 is 0.20 times 150, which equals 30.

How to calculate percentage change

Subtract the original value from the new value, divide by the original value, and multiply by 100. A positive result is an increase, while a negative result is a decrease.

What is percent difference?

Percent difference compares two numbers by dividing their absolute difference by their average, then multiplying by 100. It is useful when neither value is clearly the starting value.