What is X% of Y?
Find a percentage of a number.
X is what percent of Y?
Find what percentage one number is of another.
Percentage increase or decrease
Find the percent change from an original value to a new value.
How the percentage calculations work
To find a percent of a number, multiply the number by the percent and divide by 100. To find what percent one number is of another, divide the first by the second and multiply by 100. To find percentage change, subtract the original value from the new value, divide by the original value, and multiply by 100. A positive change is an increase and a negative change is a decrease.
Frequently asked questions
How do I find a percentage of a number?
Multiply the number by the percentage and divide by 100. 20% of 150 is 150 times 20 divided by 100, which equals 30.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. 30 of 150 is 20%.
How do I calculate percentage increase or decrease?
Subtract the original value from the new value, divide by the original, and multiply by 100. Positive is an increase, negative is a decrease.
What happens if the starting value is zero?
Percentage change cannot be calculated from a starting value of zero because it would divide by zero. Use a non-zero original value.
Is my data saved anywhere?
No. All calculations run entirely in your browser. Nothing you enter is uploaded or saved on a server.
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Disclaimer: Results are provided for general informational purposes only. Always double-check important figures independently.