Percentage Increase Calculator

Find the percentage increase, decrease or change from one value to another — or increase a value by a percentage — with every step shown.

Percentage change —
Direction —
Absolute change —

How to Calculate a Percentage Increase

Enter the starting and ending values — the percentage change is worked out instantly.

1

Enter the two values

Type the starting value and the new value. Use the second tab if instead you want to increase or decrease a number by a set percentage.

2

Read the percentage change

A positive result is an increase, a negative one a decrease. The absolute change shows the raw difference.

3

Follow the steps

The working shows the difference divided by the starting value, times 100 — the standard percentage-change formula.

Frequently Asked Questions

How do you calculate percentage increase?
To calculate percentage increase, subtract the old value from the new value to get the difference, divide that by the old value, then multiply by 100. Going from 50 to 65 gives a difference of 15, and 15 ÷ 50 × 100 = 30% increase. A negative result is a decrease, so 65 down to 50 is 15 ÷ 65 × 100, about −23.1%. The base always matters: the same absolute change gives a different percentage depending on which value you start from.
What is the difference between percentage increase and percentage change?
Percentage increase and percentage change use exactly the same formula, (new − old) ÷ old × 100. Percentage change is the general term, and the result is called a percentage increase when it is positive and a percentage decrease when it is negative. So a change of +30% and an increase of 30% are the same statement. Percentage difference is a different quantity again, because it divides by the average of the two values rather than by the original.
How do I increase a number by a percentage?
Switch to the "Increase by %" tab and enter the value and the percent. The calculator multiplies the value by (1 + percent ÷ 100). A negative percent decreases it instead.
Is my data sent anywhere?
Nothing you type is sent anywhere. The percentage increase calculator runs entirely in your browser with JavaScript, so the old and new values never leave your device. There is no account, no upload step and nothing is logged. The page keeps working offline once it has loaded.

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