Percent Change Calculator
Percent change from old value to new value.
Result
Percent change
20%
- Change
- 20
- Direction
- increase
How it’s worked out
- Percent change = (new − old) ÷ |old| × 100
- = (120 − 100) ÷ 100 × 100 = 20%
Common questions
How is percent change calculated?
Percent change = ((new value − old value) / old value) × 100. Positive means increase, negative means decrease.
What if the old value is zero?
When the starting value is 0, percent change is undefined for a positive new value; the calculator treats it as 100% for display.