How do I calculate percentage change?

Subtract the original value from the new value, divide that change by the original value, then multiply by 100. For example, going from 120 to 150 is a 30 change, and 30 ÷ 120 × 100 = 25%.

What is the formula for percentage change?

The standard formula is ((new value - original value) ÷ original value) × 100. Positive results mean an increase, while negative results mean a decrease.

When should I use percentage change instead of increase or decrease?

Use percentage change when you want one general calculation that works for both directions. It tells you whether the value went up or down and by how much relative to the starting point.

Percentage change calculator

Percentage Change Calculator

Use this percentage change calculator to compare an original value with a new value. It shows the percentage change, the absolute difference, and the formula so you can check rises and falls with one calculation.

Percentage change

25%

From 120 to 150 is a 25% change (30).

Absolute change

Direction

Increase

How it works

Use one formula for both rises and falls

Percentage change measures the movement from the original value to the new value. If the result is positive, the value increased. If it is negative, the value decreased.

Formula

((new value - original value) ÷ original value) × 100

First find the raw change, then divide by the original value, then convert the result to a percentage.

Worked example

1. Start with 120 and 150.
2. Subtract 120 from 150 to get 30.
3. Divide 30 by 120 to get 0.25.
4. Multiply by 100 to get a 25% change.

When people use this

Prices: compare last price and new price in one step.
Revenue: measure whether revenue went up or down between periods.
Traffic: compare visits, clicks, or conversions between reports.
Inventory: check whether stock levels changed and by what percentage.

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Percentage change sits between the more specific increase and decrease tools. Use those when you already know the direction, or fall back to the main calculator when you only need a percentage of a number.

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