Percentage Calculator
Calculate percentages, find what percent one number is of another, or find the whole from a known percentage.
Runs locally in your browser
Your inputs are processed locally in your browser and are not uploaded or stored by us.
How to use the Percentage Calculator
- Select the calculation you want to perform (e.g., X% of Y).
- Enter your numbers into the fields.
- Select Calculate to see the result instantly.
How to calculate a percentage of a number
Result = (Percentage ÷ 100) × Number
To find a percentage of a number, divide the percentage by 100 to convert it to a decimal, then multiply by the original number.
Example
Percentage20%
Number150
(20 ÷ 100) × 150 = 0.2 × 150
Result: 30
Notes
- How to find what percentage one number is of another: Percentage = (Part ÷ Whole) × 100. Example: 30 is what percent of 150? (30 ÷ 150) × 100 = 20%.
- How to find the whole when you know the percentage: Whole = Part ÷ (Percentage ÷ 100). Example: 30 is 20% of what? 30 ÷ (20 ÷ 100) = 30 ÷ 0.2 = 150.
- Need to compare an old and new value? Use the Percentage Change Calculator to calculate the percentage increase or decrease between two values.