Calculator
Percentage calculator
Calculate percentage values, rates, base values, changes and differences on one page.
Calculation mode
Your percentage calculation
What is X% of Y?
The base value is multiplied by the percentage divided by 100.
Result
Percentage value
30
Values in proportion
Base value150
Percentage value30
Understanding percentage calculations
A percentage value describes a share of a base value. Percentage change always refers to an initial value, while percentage difference compares two values symmetrically through their average magnitude.
Practical notes
- ✓Check which value is the base or initial value.
- ✓A result above 100% can be mathematically valid.
- ✓Negative values are accepted whenever the selected formula remains defined.
Percentage value
The base value is multiplied by the percentage divided by 100.
Frequently asked questions
Why can the base value not be 0 in a percentage-rate calculation?
The formula would have to divide by 0, which has no defined result.
What is the difference between change and difference?
Change has a direction and refers to an initial value. Difference treats both comparison values equally.
Can a percentage be greater than 100?
Yes. A partial value can exceed its base value, and an increase may also be greater than 100%.