Percentage calculator
Find a percentage of a number, plus totals after adding or subtracting it.
CalculatorsCalculators
Percentage change calculator
Measure the percentage increase or decrease between two non-negative values.
Your result
A little input. A useful result.
Adjust the example inputs, then select Calculate change.
About this tool
Compare a positive starting value with a new value to measure its change. The result shows both the absolute difference and the percentage increase or decrease from the starting point.
How to use it
- 1
Enter a starting value greater than zero.
- 2
Enter the new value, which may be zero.
- 3
Calculate the signed difference and percentage change.
Questions, answered
Why can the starting value not be zero?
Percentage change divides the difference by the starting value. A zero starting value makes that calculation undefined.
Is percentage change symmetric?
No. An increase from 80 to 100 is 25%, while a decrease from 100 to 80 is 20%, because the starting value changes.