Percentage Increase/Decrease Calculator
Find percent change between two values — instantly. Includes difference, direction, and a clean step-by-step breakdown.
Explanation
The Percentage Increase/Decrease Calculator measures how much a value changed relative to its starting point. It is commonly used in finance, pricing, business metrics, sales growth, and comparisons like “this month vs last month”.
Tip: If the old value is 0, percent change cannot be computed (division by zero). In that case, use the absolute difference instead.
Formula
Percent change = ((new - old) / old) × 100
FAQs
When is percent change undefined or infinite?
If the old value is 0, percent change is undefined/infinite because you can’t divide by zero.
Sign meaning?
Positive means increase and negative means decrease.
Can it exceed 100%?
Yes. If the new value is more than double the old value, percent increase is greater than 100%.
Is this the same as percentage points?
No. Percentage points are the absolute change between percentages (e.g., 10% to 12% is +2 points).
Rounded result?
For general use, 2 decimals is common. For dashboards, 0–1 decimals may be enough.