Percent Change Calculator

Old → New percent change

Percent change
—
Difference
—

What Is a Percent Change Calculator?

A percent change calculator helps you determine how much a value has increased or decreased compared to its original amount. It is widely used in finance, statistics, and performance tracking.

How to Calculate Percent Change

Find the difference between the new value and the old value, divide by the old value, and multiply the result by 100.

Formula

Percent Change = ((New − Old) ÷ Old) × 100

Percent Change Example

If a price rises from 100 to 130: ((130 − 100) ÷ 100) × 100 = 30% increase.

Where Is This Used?

Frequently Asked Questions

How do I calculate percentage growth?

Subtract the old value from the new one, divide by the old value, and multiply by 100.

How do I calculate percentage decrease?

Use the same formula; the result will be negative if the value dropped.

The Math Behind Percent Change

This calculation measures proportional difference and shows how large the change is relative to the starting point.

You Might Also Need

All Calculator Tools