Free Percentage Change Calculator – Calculate Increase & Decrease Online
Percentage change is a fundamental mathematical concept used across finance, science, business, and everyday life. It measures the relative difference between an old value and a new value, expressed as a percentage of the original. Understanding percentage change helps you make better decisions whether you are analyzing stock prices, comparing test scores, or tracking weight loss progress.
The formula is straightforward: Percentage Change = ((New Value - Old Value) / |Old Value|) x 100. A positive result indicates an increase, while a negative result indicates a decrease. Our calculator handles all the math instantly — simply enter your two values and get the result immediately.
Percentage change is different from percentage difference. Percentage change compares a new value to an original value and shows the direction of change (increase or decrease). Percentage difference compares two values without implying which is the original, using the average of the two as the base.
Common applications include calculating price changes in stocks and commodities, measuring inflation rates, tracking business revenue growth, analyzing population changes, and comparing scientific measurements across experiments. Financial analysts, marketers, teachers, and researchers all rely on percentage change calculations daily.