Percentage Change Calculator

Calculate percentage change from an original value to a new value, including absolute change and increase or decrease status.

926.3K uses Updated · 2026-05-09 Runs locally · zero upload
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How to Use Percentage Change Calculator

The Percentage Change Calculator compares an original value with a new value. Enter both numbers and choose the decimal places. The result panel shows the percentage change, absolute change, original value, new value, and whether the change is an increase, decrease, or no change.

Use consistent units for both inputs. The calculator handles positive, negative, and decimal values, but the original value cannot be zero in the standard formula.

Formula & Theory - Percentage Change Calculator

The Percentage Change Calculator uses the standard baseline formula.

percentage change = ((new value - original value) ÷ original value) × 100%

For example, moving from 100 to 120 gives (20 ÷ 100) × 100% = 20%. Moving from 120 to 100 gives a negative result because the value decreased.

Use Cases for Percentage Change Calculator

Use the Percentage Change Calculator for price changes, salary growth, website traffic, body weight, grades, costs, sales, and reporting. It is useful whenever the direction of change matters.

Frequently asked questions about Percentage Change Calculator

What does a negative percentage change mean?

A negative result means the new value is lower than the original value, so the change is a decrease.

Why is original value zero invalid?

The standard formula divides by the original value, so a zero baseline would require division by zero.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.