Free Percentage Calculator Online
Solve common percentage calculations: find a percent of a value, calculate what percent one number is of another, or measure percentage change.
Percentage increase or decrease
Enter values to calculate.
Private: your files are processed in your browser and are never uploaded to our server.
How to use
- Choose the calculation you need.
- Enter the required numbers.
- Read the result; calculations happen instantly in your browser.
Calculate percentages and percentage change
A percentage expresses a value out of 100. Percentage change compares a new value with an original value; percentage-point difference is a separate concept.
Results are calculated locally in your browser. When the original value is zero, percentage change is undefined and the tool reports that instead of inventing a result.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100.
What is percentage change?
Subtract the original value from the new value, divide by the absolute reference? Standard percentage change uses the original value as the denominator, then multiply by 100. This tool uses that standard definition and reports an undefined result when the original value is zero.
Is this calculator private?
Yes. Inputs are processed locally in your browser.