Percentage Calculator
Find a percentage of a number, what percent one number is of another, percentage change, or the total from a part.
Choose a Calculation
What is X% of Y?
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How These Calculations Work
- % of Number — multiply the number by the percentage and divide by 100. 20% of 150 = 30.
- What % — divide X by Y and multiply by 100. 30 out of 200 = 15%.
- % Change — divide the difference between the two numbers by the original number, then multiply by 100.
- Find Total — divide the part by the percentage (as a decimal). 20 is 25% of 80.
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 (20 × 150) ÷ 100 = 30.
How do I calculate percentage increase or decrease?+
Subtract the original value from the new value, divide by the original value, then multiply by 100. A positive result is a percentage increase; a negative result is a percentage decrease.
How do I find the total when I know a part and its percentage?+
Divide the part by the percentage (expressed as a decimal). For example, if 20 is 25% of a number, the number is 20 ÷ 0.25 = 80.