Free Percentage Change Calculator
Calculate the percentage change between an old value and a new value to quantify the relative magnitude of change.
Percentage Change (%)
25.0000
Absolute Change20.0000
New / Old Ratio1.250000
Percentage Change (%) vs Old Value
How to Calculate Percentage Change
Formula
% Change = [(New - Old) / Old
Percentage change measures the relative difference between two values. A positive result indicates an increase; negative indicates a decrease. Using the absolute value of the old value in the denominator handles cases where the old value is negative.
Example Calculation
A price changes from $80 to $100.
- 01Change = 100 - 80 = 20
- 02% Change = (20 / 80) * 100 = 25%
- 03Ratio = 100 / 80 = 1.25
- 04The price increased by 25%
Frequently Asked Questions
Learn More
Understanding the Normal Distribution
Learn what the normal distribution is, why it matters in statistics, and how to use the bell curve for probability calculations, z-scores, and real-world data analysis.