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Percentage Change Calculator
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Formula: % Change = ((New Value - Old Value) / |Old Value|) × 100
Examples
- Old: 100, New: 150 → Change Amount: 50, % Change: 50% Increase
- Old: 150, New: 100 → Change Amount: -50, % Change: 33.33% Decrease
- Old: 50, New: 50 → Change Amount: 0, % Change: 0% No Change
Frequently Asked Questions
How is percentage change different from increase/decrease?
Percentage change automatically determines if the value went up or down based on the inputs.
What if the old value is negative?
The formula uses the absolute value of the old denominator to correctly determine the direction of change.
Can percentage change be zero?
Yes, if the old and new values are exactly the same, the change is 0%.
What if the old value is zero?
Mathematically, division by zero is undefined, so you cannot calculate a percentage change from exactly zero.
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