Percentage Calculator
Work out a percentage of a number, what percent one number is of another, or the percent change between two values.
This tool runs entirely in your browser; what you enter is never sent to our servers.
How to use it
- Choose the calculation: percent of a number, what percent, or percent change.
- Enter the two values; a dot or a comma both work as the decimal separator.
- The result updates as you type — copy it with “Copy”.
Formulas and examples
Percent of a number: number × percent ÷ 100. 20% off a $85 jacket: 85 × 20 ÷ 100 = $17 off. What percent: part ÷ whole × 100. 42 correct answers out of 50: 42 ÷ 50 × 100 = 84%. Percent change: (new − old) ÷ |old| × 100. Rent going from $1,500 to $1,650: (1,650 − 1,500) ÷ 1,500 × 100 = a 10% increase. Results are rounded to at most two decimal places.