Summary
Measure the absolute and percentage change between two values.
Calculation details
A positive difference is an increase, a negative difference a decrease, and zero means no change. Calculations retain raw JavaScript number precision; display values are rounded to at most six decimal places.
Formula
Percentage change = (new − original) / |original| × 100.
Worked example
Percentage Change Calculator example
An increase of 20 equals 25%.
How it works
Enter the original and new values. The percentage change uses the absolute value of the original as the denominator so direction stays in the signed difference.
Frequently asked questions
How accurate is the Percentage Change Calculator?
The calculation keeps raw numeric precision and rounds only the displayed result to at most six decimal places.
What should I do with an invalid result?
Check that every visible value is finite and that no required divisor is zero.