Percentage Calculator
Find a percentage of a number, what percentage one number is of another, or the change between two values.
Enter your values
Fill in every field marked as required, then choose Calculate.
Result
Results appear below the form and can be copied or downloaded.
How it works
Method
A% of B = A ÷ 100 × B. "A is what percent of B" = A ÷ B × 100. Percentage change = (B − A) ÷ |A| × 100.
Units
Plain numbers without units. Results are rounded to the configured number of decimal places.
Examples
- 15% of 200 is 30.
- 30 is 15% of 200.
- From 80 to 100 is a 25% increase.
Limitations
Dividing by zero is not defined, so B cannot be zero for "what percent" and A cannot be zero for a percentage change. Very large values are limited to one trillion.
Frequently asked questions
How is the result calculated?
A% of B = A ÷ 100 × B. "A is what percent of B" = A ÷ B × 100. Percentage change = (B − A) ÷ |A| × 100.
Are there any limitations?
Dividing by zero is not defined, so B cannot be zero for "what percent" and A cannot be zero for a percentage change. Very large values are limited to one trillion.