Foot to Millimeter Converter
Convert feet to millimeters instantly. Free, bidirectional, and fully in-browser.
About this tool
Foot to Millimeter Converter
Convert feet to millimeters instantly. Free, bidirectional, and fully in-browser.
1 foot equals 304.8 millimeters — enter any foot value to convert it to millimeters instantly. This Foot to Millimeter converter is a client-side tool: it applies a single multiplication (mm = ft × 304.8) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert millimeters back to feet. A reference table lists common foot values already converted, and nothing you enter is sent to a server.
How to use Foot to Millimeter Converter
- 1
Open Foot to Millimeter Converter on AltFTool — it loads instantly in your browser.
- 2
Type the value you want to convert into the Foot field.
- 3
Read the equivalent in millimeters in the result field, and copy it if needed.
- 4
Use the decimal-places slider for more or less precision, or press swap to convert millimeters to feet.
Why use Foot to Millimeter Converter
Instant, both ways
The result updates as you type, and the swap button flips the conversion to millimeter → foot without reloading.
Exact Length math
The conversion uses the precise factor (mm = ft × 304.8), so the number matches a manual calculation to the decimal places you choose.
Adjustable precision
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Private and free
Everything runs locally in your browser — no upload, no account, no limit on conversions.
Common use cases
- Converting a foot measurement to millimeters for a spec, listing, or report.
- Checking foot↔millimeter figures while comparing products, datasets, or documentation.
- Learning the foot-to-millimeter relationship from the worked formula and the common-value table.
Frequently asked questions
How many millimeters are in a foot?
One foot is 304.8 millimeters. Multiply the foot value by 304.8 to convert. For example, 10 ft = 3048 mm.
What is the formula to convert feet to millimeters?
mm = ft × 304.8. This tool applies it automatically and shows a worked example: 10 ft = 3048 mm.
Can it convert millimeters back to feet?
Yes. Press the swap button, or type into the millimeter field, and the tool converts millimeters to feet using the inverse of the same relationship.
Is the conversion accurate?
It uses the standard distance and length definition (mm = ft × 304.8), not a rounded approximation, so results are exact to the number of decimal places you select.
Does this work offline and stay private?
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
Embed this tool on your site
Add the Foot to Millimeter Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/feet-to-millimeters-converter"
title="Foot to Millimeter Converter — free AltFTool widget"
width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/feet-to-millimeters-converter?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>