Ratio Calculator
Simplify a ratio, and see it as shares of the whole.
Work out Ratio. Simplify a ratio, and see it as shares of the whole. Handles the cases the shortcuts get wrong.
Optional.
Simplified ratio
2 : 3
As a decimal, 0.666667 : 1
Simplifying divides every part by their greatest common factor, which changes how the ratio is written without changing what it means. The percentages are the same information expressed against the whole rather than against each other — useful when the parts are being shared out rather than compared.
How the Ratio Calculator works
Simplifying divides every part by their greatest common factor, which changes how a ratio is written without changing what it means. The percentages alongside are the same information measured against the whole rather than against each other — the form you want when the parts are being shared out.
Also known as: simplify a ratio · ratio to percentage calculator · ratio to fraction converter · how to simplify a ratio
Frequently asked questions
How do I simplify a ratio?
Divide every part by their greatest common factor. 12 : 18 has a GCF of 6, so it simplifies to 2 : 3.
How do I turn a ratio into a percentage?
Divide each part by the total. In 12 : 18 the total is 30, so the parts are 40% and 60%.
Can a ratio have decimals?
Yes, and this scales them to whole numbers first — 2.5 : 5 simplifies to 1 : 2 rather than staying in decimal form.
What is the difference between a ratio and a fraction?
A ratio compares parts to each other; a fraction compares a part to the whole. In 2 : 3, the first part is two thirds of the second but two fifths of the total.
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.
<iframe src="https://www.thecalclibrary.com/embed/ratio-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Ratio Calculator"></iframe>The only condition is that the credit line stays visible. It sits inside the frame, so you do not have to do anything to keep it.