Percentage Change Calculator
Calculate percentage increase, percentage decrease, and relative difference between an original value and a new value.
How to Use the Percentage Change Calculator
Enter your initial (original) value and your final (new) value. The tool computes the difference, identifies whether it is an increase or decrease, and calculates the exact percentage change.
Formula & Calculation Method
Percentage Change = ((New Value - Original Value) / |Original Value|) × 100Subtract the initial value from the new value, divide the result by the absolute value of the original, and multiply by 100.
Calculation Examples
Price Increase from $50 to $75
((75 - 50) / 50) × 100 = +50%
Price Decrease from $100 to $80
((80 - 100) / 100) × 100 = -20%
Frequently Asked Questions
What does a negative percentage change mean?
A negative percentage change indicates a decrease or drop from the original value to the new value (for example, a price reduction or metric decline).
Can the original value be zero?
Mathematically, you cannot divide by zero. If the original value is zero, percentage change is undefined. Our tool explicitly warns you instead of displaying invalid results.