Percentage Change Calculator
Calculate percentage change, difference, error, and more
From A to B
Result
Enter values and click Calculate
About Percentage Calculations
% Change
((B − A) / |A|) × 100
Measures relative change from original to new value. Positive = increase, negative = decrease.
% Difference
|A − B| / avg(A,B) × 100
Compares two values without implying direction. Always positive.
% Error
|measured − actual| / |actual| × 100
Used in science to express measurement accuracy relative to the true value.