Conversion & calculation
Percentage Change Calculator
Compare an original and new value to calculate a percentage increase or decrease.
Percentage change
Measure the change from an original value.
Results are rounded to up to six decimal places.
How to use
- Enter the two values as labeled in the calculator.
- Select Calculate or press Enter to see the result and formula used.
Formula and conversion method
Change = (new − original) ÷ |original| × 100
Worked example
100 to 80 → (80 − 100) ÷ 100 × 100 = −20%
Things to know
Change from zero is undefined. Negative original values use an absolute-value denominator. This is different from a percentage-point difference.