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Percentage Change Calculator

Calculate percentage change between two values. Useful for prices, KPIs, growth, and reports.

Reset

Tip: For business reporting, percent change is commonly computed as (new − old) ÷ |old| × 100. If your baseline is 0, percent change is undefined — we’ll show the absolute difference instead.

Results

Difference (new − old)
30.00
Percent change
25.00%
Old value
120.00
New value
150.00

Interpretation: your value changed by 25.00% (based on the magnitude of the old value).

How it works

Difference = new − old.
Percent change = (new − old) ÷ |old| × 100. Using |old| helps keep the percent meaningful when old is negative (common in some KPIs).

Examples

  • Old 120 → New 150: difference 30; percent change 25%.
  • Old 80 → New 60: difference -20; percent change -25%.
  • Old 0 → New 50: percent change undefined; difference 50.

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Understanding Percentage Change

Percentage change is one of the most common ways to compare values over time. It helps answer questions such as how much something increased, decreased, or changed relative to its original value. This calculator simplifies that process.

The Percentage Change Calculator lets you enter an original value and a new value to instantly see the percentage difference between them. It’s useful in everyday situations—from comparing prices to reviewing performance metrics.

When should you use this tool? It is ideal for analyzing price changes, financial results, sales growth, conversions, and other metrics where relative change matters.

Who is it for? Students, professionals, investors, business owners, and anyone who needs quick and reliable percentage calculations.

Important notes: This tool performs a mathematical calculation only. It does not interpret results and it does not store any data.