Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
Results
Percentage change measures how much a value has increased or decreased relative to its original amount. Enter the old value and new value to see the percentage change, absolute difference and multiplier. This is essential for tracking price changes, performance metrics, revenue growth and investment returns.
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Frequently asked questions
Percentage change = ((New - Old) / |Old|) × 100. If a stock goes from $80 to $100, the change is ((100 - 80) / 80) × 100 = +25%.
A 50% drop followed by a 50% gain does not get you back to even. $100 drops to $50 (-50%), then $50 gains 50% = $75 (not $100). You need a +100% gain to recover from a -50% loss.
If interest rates go from 4% to 5%, that is a 1 percentage point increase but a 25% percentage change. Percentage points measure the absolute difference between rates; percentage change measures the relative difference.
Use the same formula with last year's value as 'old' and this year's as 'new'. If revenue went from $500,000 to $650,000, YoY growth = ($650k - $500k) / $500k × 100 = +30%.
Yes. If a value goes from 50 to 200, that is a +300% change (tripled from the original). Any time the new value is more than double the old, the percentage change exceeds 100%.