Percentage Change Calculator
Calculate the percentage increase or decrease between two values. Useful for finance, statistics, and everyday comparisons.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator computes the percentage change between an old and a new value.
- Enter the Old Value – Type the original number (e.g., 100).
- Enter the New Value – Type the updated number (e.g., 150).
- Click "Calculate" or press Enter on any field.
Result: Shows the absolute percentage change and whether it’s an increase or decrease. The formula and step-by-step calculation are displayed below.
Note: The old value cannot be zero. Use any numeric format (decimals, negatives, etc.). No units required.
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Frequently Asked Questions
Percentage change measures the relative difference between an old value and a new value, expressed as a percentage. It is calculated as ((New - Old) / Old) × 100.
Yes, the calculator works with negative numbers. However, if the old value is zero, the calculation is undefined (division by zero) and will show an error.
A positive percentage change indicates an increase from the old value to the new value. A negative percentage change indicates a decrease.
