Percentage Change Calculator
Calculate the percentage increase or decrease between two values; e.g. 100 → 120 = 20% increase.
Percentage change
How is percentage change calculated?
Percentage change shows how much a new value increased or decreased compared with an old one. The formula is (new − old) ÷ |old| × 100. If a price went from 250 to 300, the increase is 20%.
What the calculator shows
- Percentage increase or decrease
- The absolute difference between the two values
- The multiplier (e.g. 1.2×)
Examples
- Price rises and inflation
- Your salary increase as a percentage
- Monthly sales, web traffic or follower growth
- Stock and currency movements
The result updates in your browser as you type.
How to use Percentage Change Calculator
- Enter the old (starting) value.
- Enter the new value.
- The percentage change, difference and multiplier appear instantly.
- Use the result in your report or calculation.
Why use this tool?
Get the correct percentage increase or decrease in seconds without remembering the formula.
FAQ
Why can't the old value be zero?
The percentage change from zero is undefined because it would divide by zero. The absolute difference is still shown.
Why doesn't +50% then −50% get back to the start?
The decrease is applied to a larger value: 100 → 150 (+50%) → 75 (−50%).
What's the difference between percent change and percentage points?
A rate going from 10% to 12% is a 2 percentage point rise but a 20% change.
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