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Percentage Change Calculator
Find the percentage increase or decrease between two values.
25% increase
Change25%
Difference20
Formula / method
change % = (new − old) ÷ |old| × 100
Examples
80 → 100
+25%
+25%
200 → 150
−25%
−25%
How to use
Enter your values above — the result updates instantly as you type. Everything is computed locally in your browser, so it is fast and private.
FAQ
What if the old value is zero?
Percentage change is undefined when the starting value is zero, because you cannot divide by zero. Use the absolute difference instead.