Percentage Increase Calculator

How much something went up, and the multiplier behind it.

How much something went up, and the multiplier behind it. The size of an increase as a percentage of where it started.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Original value

New value

Percentage increase

50.00%

100 → 150, a increase

Absolute change50

Percentage change+50.00%

Percentage difference (symmetric)40.00%

Multiplier× 1.5

Reverse needed to undo it33.33%

Percentage changes do not reverse symmetrically. This increase of 50.00% would need 33.33% in the opposite direction to undo — a 50% fall famously needs a 100% rise to recover. Multiplying by 1.5 is the same operation stated without that trap.

How the Percentage Increase Calculator works

The size of an increase as a percentage of where it started. The multiplier alongside is the same fact stated without the trap: a 50% increase is a multiplier of 1.5, and stacking two of them gives 2.25 rather than 2.

Also known as: percent increase formula · how to calculate percentage increase · add a percentage to a number · price increase calculator

Where to go next

The Percentage Increase question rarely arrives on its own. These are the ones that usually come with it:

Percentage Decrease Calculator — How much something fell, and what it takes to recover.
Percentage Change Calculator — Change, and the reverse move needed to undo it.
Exponential Growth Calculator — Growth or decay, with doubling time and half-life.
Percentage Calculator — Every common percentage question in one place.

Sources

NIST Digital Library of Mathematical Functions

Frequently asked questions

How do I calculate a percentage increase?

Divide the increase by the original value and multiply by 100. From 100 to 150 is a 50% increase.

How do I add a percentage to a number?

Multiply by 1 plus the percentage as a decimal. Adding 50% means multiplying by 1.5.

Do two 50% increases make 100%?

No — they make 125%. Each applies to the result of the last, so 1.5 × 1.5 is 2.25, not 2.

How do I reverse a percentage increase?

Divide by the multiplier, not by subtracting the same percentage. Undoing a 50% rise means dividing by 1.5, which is a 33.3% fall.

Put this calculator on your own site

Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.

The one-line version

<iframe src="https://www.thecalclibrary.com/embed/percentage-increase-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Percentage Increase Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/percentage-increase-calculator" style="color:#64748b">Percentage Increase Calculator</a> from The Calc Library</p>

The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.