Percentage Change Calculator
Calculate percent increase or decrease between two values and see the formula, substitution, and result.
Calculate percentage change
Answer
25% increase
- Change = 100 - 80 = 20
- Percent change = 20 / 80 * 100 = 25%
How to use the percent change calculator
Use this page when you know an old value and a new value and need the percentage increase or decrease.
- Enter the original value.
- Enter the new value.
- Compare the signed percent change and the absolute change.
Formula or method
Percentage change = ((new value - old value) / old value) * 100%.
Worked examples
Increase
Problem: Old value 80, new value 100
Solution: (100 - 80) / 80 * 100 = 25% increase.
Decrease
Problem: Old value 50, new value 40
Solution: (40 - 50) / 50 * 100 = -20%, so it is a 20% decrease.