Percentage Change Calculator
Find the percentage increase or decrease between two values.
● Processed locally in your browser unless the page says otherwise.
How it works
How percentage change is calculated
Percentage change compares how much a value increases or decreases from an old value to a new value. It is commonly used for revenue growth, price changes, cost changes, traffic changes, and performance comparisons.
The old value is usually the base. The same absolute change can produce a different percentage change when the starting value is different.
Formula or logic
- Percentage change = (New value - Old value) ÷ Old value × 100%
Example
If revenue increases from 80,000 to 100,000, the increase is 20,000 and the percentage change is 25%. If it drops from 100,000 to 80,000, the decrease is 20%.
Common questions
Why does +25% then -25% not return to the original value?
Because the second percentage is calculated from a new base value. Percentage change always depends on its base.
Can I calculate change from zero?
Not with the standard formula because the denominator is zero. Use the absolute change or another metric instead.
Can it handle negative values?
It can, but interpretation may be tricky, especially when values cross zero.