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Percentage Change Calculator

Increase, decrease and the difference between two numbers.

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Percentage change

Measured against the starting value, with a direction.

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Absolute change—
Multiplier—
Percentage points—

If both numbers are already percentages, the points difference is the one to quote — a move from 5% to 6% is one percentage point, but a 20% increase.

Percentage difference

For when neither value is the baseline — measured against their average.

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Change or difference?

Use change when one value came first — last year's revenue against this year's. Use difference when comparing two things of equal standing, such as two suppliers' quotes.

Several changes in a row

Consecutive percentage changes compound — they do not add up. Enter them separated by commas.

StepChangeValue afterCumulative

Quick Tool Overview

The Percentage Change Calculator works out the change between an old value and a new one, labelled as an increase or a decrease and shown with its arithmetic. It also handles percentage difference and percentage points, the two distinctions that cause most of the confusion in reporting.

What it does
Calculates percentage change, difference and percentage points
You give it
An old value and a new value
You get back
The change with direction, the working and the point difference
Best for
Sales reports, price rises, KPIs and year-on-year comparisons
Calculators Free, unlimited use No sign-up Runs in your browser

About the Percentage Change Calculator

Enter an old value and a new value to get the percentage change between them, labelled as an increase or a decrease and shown with the arithmetic that produced it. A separate panel calculates percentage difference, which is a different measure.

Change is measured against the starting value, difference is measured against the average of the two, and mixing them up produces two different answers to what sounds like one question. The page also handles percentage points, the distinction that trips up reporting most often: a rate moving from 5 percent to 6 percent has risen by one percentage point but by 20 percent. A multi-period panel compounds a series of changes so you can see the net effect of several consecutive moves.

Key features of the Percentage Change Calculator

Change and difference kept apart

Change is measured against the starting value and difference against the average of the two — mixing them gives two answers to one question.

Percentage points handled

A rate moving from 5 percent to 6 percent has risen one percentage point but 20 percent, and both are reported.

Direction labelled

Results are marked as an increase or a decrease, so a negative sign is never misread.

Multi-period compounding

A series of consecutive changes is compounded to show the true net effect, which is not the sum of the parts.

Arithmetic shown

Every result prints the calculation behind it, ready to paste into a report.

How to use the Percentage Change Calculator

  1. 1

    Enter the two values

    Type the original value and the new value. The change is calculated instantly.

  2. 2

    Read the direction

    The result is labelled as an increase or a decrease, with the formula shown underneath.

  3. 3

    Check percentage points

    If both your numbers are already percentages, the points difference is shown alongside the percentage change.

Frequently asked questions

Subtract the old value from the new, divide by the old value, then multiply by 100. Going from 80 to 100 is (100 - 80) / 80 x 100, a 25 percent increase.

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