About InchToCM

What this site does

InchToCM creates fast loading, easy to read unit conversion tools. Our primary tool is the inches to cm converter. We’ve created it the way we think a reference tool should work:

• The solution shows up as you type.
• The working is down below so you can see how we came up with the number.
• The page has nothing else to distract you from the result you came for.

You don’t need an account and we never ask for personal details to use the converter. The calculation happens in your browser, so the value you type never leaves your device. 

Why we built it

For most people converting inches to centimeters is an incidental activity. My task is to humanize the following text in the English language, keeping its meaning and tone. Don't add or omit any information. Don't add any other text to the output. For example:

• A 27 inch screen is 68.58 cm across the diagonal. Buying a monitor
• Frame sizes for photo Frame size 8 x 10 inch = 20.32 x 25.4 cm
• Filling out a shipping form. Parcel size in centimeters required by courier. Tape measure only in inches.
• Reading a sewing pattern or spec sheet with 3/8-inch seam allowance 0.9525 cm

For these people, the conversion is a two second diversion. So we built the tool to spit out the answer immediately and then get out of the way. Works just as good on a phone held in one hand as it does on a desktop.

And we provide you items that most reference sites don’t. Discover why the ratio is exactly 2.54 and how to convert fractional inches. If you know the rule, you can check any figure yourself. 

Editorial policy

Our own team writes everything on this site. We hold every page to these standards.

Accuracy comes first.

We take conversion factors from two sources:

• The international yard and pound agreement of 1959, which fixed the inch at exactly 2.54 centimetres.
• SI definitions for all metric units.

When a figure is exact, we say so. When we round a value for display, the working line still shows the full-precision result, so you can check it.

How we test the tools

Before we publish a calculator, we test it against a set of known values:

• whole numbers, such as 12 inches = 30.48 cm
• decimals, such as 5.5 inches = 13.97 cm
• fractional inches, such as 1/16 inch = 0.15875 cm
• very large numbers
• invalid entries, such as letters, blank fields and negative values

We publish a tool only when it handles wrong input as cleanly as correct input. Every time we change the code, we run these checks again.

Fact-checking the writing

We review the explanatory text separately from the code. The person credited on each page checks it. We trace every claim about definitions, history and standards back to the standards body or agreement that set it. We don't rely on other websites for these facts. If we can't verify a statement, we leave it out.

Updates and corrections

Each page shows a review date, so you can see how current it is.

If you spot an error, tell us through the contact form. We aim to reply within a few working days and fix confirmed mistakes quickly. When a correction is significant, we add a note on the page to explain what changed.

Independence

Advertising pays for this site. We label every ad clearly and keep ads away from the tools and the article text. Advertisers have no say in what we publish. They can't influence any result, recommendation or explanation on this site.

Contact us.

Have a question, a suggestion for a new converter, or a mistake to report? Email us at hello@inchtocm.co.uk or use the contact form.