Percentage Change Calculator

Measure the relative increase or decrease from an original value to a new value, together with the absolute difference.

Calculation, not advice. Results are illustrative and depend entirely on the values entered.

Reviewed by the LikeOptions Editorial Team · Methodology in how the calculation works below

Worked exampleA change from 200 to 250 is an absolute increase of 50 and a percentage increase of 25%. Reversing the values produces a different percentage because the base changes.

Percentage Change Calculator estimate

Illustrative

Percentage change

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Based on the assumptions entered

Relative magnitude of displayed valuesNegative values use absolute height

Important: This simplified estimate may exclude taxes, fees, timing differences, changing rates and other real-world conditions.

The concept

What percentage change measures

Percentage change expresses a difference relative to the starting value. It makes changes in differently sized quantities easier to compare.

The original value is the denominator. If it is zero, percentage change is undefined even though an absolute difference can still be calculated.

The method

How to calculate percentage change

The original value is subtracted from the new value. That difference is divided by the absolute original value and multiplied by 100.

Change % = (new − original) / |original| × 100

The difference is divided by the absolute original value, preserving the direction of the change.

Worked example

Percentage Change Calculator example

A change from 200 to 250 is an absolute increase of 50 and a percentage increase of 25%. Reversing the values produces a different percentage because the base changes.

This example explains the method. It does not recommend a financial action or predict an outcome.

Frequently asked

Percentage Change Calculator questions

Why is change from zero undefined?

Division by zero is undefined, so no finite percentage can be produced.

Can the result be negative?

Yes. A negative result represents a decrease from the original value.

Is percentage change the same as percentage-point change?

No. Percentage points compare two percentages directly; percentage change measures their relative difference.

Enter percentage change calculator assumptions