Percentage Change Calculator — Increase or Decrease

Free percentage change calculator. Calculate the percentage increase or decrease between two values.

Formula: (New Value - Old Value) / Old Value × 100

What Is This Calculator?

A percentage change calculator determines the relative change between two numbers expressed as a percentage. Positive values indicate an increase; negative values indicate a decrease. It is one of the most universally used calculations in business, science, and daily life.

How to Calculate

To calculate percentage change: 1) Find the old (original) value. 2) Find the new (current) value. 3) Subtract old from new. 4) Divide by old. 5) Multiply by 100. Formula: % Change = (New − Old) / Old × 100.

Examples

Example: Sales went from 200 units to 250 units. % Change = (250 − 200) / 200 × 100 = 25% increase.

Recommended Tools

Any spreadsheet application (Google Sheets, Excel) can calculate percentage changes across large datasets.

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