Mathematics
Percentage change
Calculate the percentage increase or decrease between two values.
Your numbers
Both a decimal point and a comma work.
Result
20 %
Percentage change
- Difference
- 20
How it works
Δ = (B − A) / A × 100%
Using the calculator
Enter: Original value · New value. Calculation: Δ = (B − A) / A × 100%.
Worked input and result
Example: Original value = 80; New value = 100. Result: Percentage change = 25 % (Difference: 20).
Understanding the result
The difference is divided by the initial value. Percentage change from zero is undefined.
The calculation uses the original value as the denominator, so a change from 80 to 100 is +25%, not +20%. An original value of zero cannot be used for this relative change.