Percentage Change Calculator
Calculate the percentage increase or decrease between two values instantly.
Last updated: 2026-03-06
Percentage change calculator
Enter your values
Enter the original and new values to find the percentage change.
Change
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Enter two values to see the percentage change.
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Example calculations
Tap an example to prefill the calculator with sample values.
Stock Price Increase
$50 to $75
A stock price rising from $50 to $75.
Result: +50.00% increase
Price Drop
$100 to $80
A product price dropping from $100 to $80 during a sale.
Result: −20.00% decrease
Revenue Growth
$250,000 to $312,500
Quarterly revenue growth from Q1 to Q2.
Result: +25.00% increase
How percentage change is calculated
Percentage change measures the relative difference between an original value and a new value, expressed as a percentage of the original.
Formula: Percentage Change = ((New Value − Original Value) / |Original Value|) × 100
A positive result indicates an increase, while a negative result indicates a decrease. For example, if a stock price moves from $50 to $75, the percentage change is +50%.
The absolute value of the original is used in the denominator to handle negative starting values correctly. When the original value is zero, percentage change is undefined (division by zero).
Percentage change is commonly used in finance (stock returns, revenue growth), science (measurement changes), and everyday comparisons (price increases, weight changes).
Percentage change FAQs
Answers to common questions about percentage change.
What is the percentage change formula?
Percentage Change = ((New Value − Original Value) / |Original Value|) × 100. A positive result means an increase; a negative result means a decrease.
What happens when the original value is zero?
When the original value is zero, percentage change is mathematically undefined (division by zero). The calculator will show an error in this case.
What is the difference between percentage change and percentage difference?
Percentage change measures the relative change from an original value to a new value (directional). Percentage difference compares two values without designating one as the original (uses the average as the denominator).
Can I use this for negative numbers?
Yes. The calculator uses the absolute value of the original number in the denominator, so it handles negative starting values correctly.
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Disclaimer
This calculator provides standard percentage change calculations. When the original value is zero, percentage change is undefined.
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