Percentage of a value
Find a percentage of a value, such as 20% of 150.
Percentage Calculator
Calculate common percentage problems quickly and directly in your browser.
Result
Your result will appear here.
Percentage calculations explained
Share as a percentage
Find what percentage one value represents of another.
Percentage change
Compare an old value with a new value to determine the percentage increase or decrease.
Increase a value
Add a selected percentage to an existing value.
Decrease a value
Subtract a selected percentage from an existing value.
Examples
Calculate a percentage
20% of 150 is 30.
Calculate a percentage change
A change from 100 to 125 is an increase of 25%.
Frequently asked questions
What is a percentage?
A percentage expresses a value as a share of one hundred.
How do I calculate X% of Y?
Multiply Y by X and divide the result by 100.
How do I calculate what percentage X is of Y?
Divide X by Y and multiply by 100. Y must not be zero.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100. The old value must not be zero.
How do I increase or decrease a value by a percentage?
For an increase, add the percentage share to the value. For a decrease, subtract it.
Can I use decimal and negative values?
Yes. Use a decimal point; negative values are accepted where the calculation is mathematically defined.
Are my values transmitted or stored?
No. Calculations are performed locally in your browser, and your values are not transmitted or stored by fourwww.