Convert Feet to Millimeters
Feet to millimeters gives you the fine-grained precision millimeters offer, useful in manufacturing and engineering drawings. One foot is exactly 304.8 millimeters.
Feet to Millimeters conversion table
| Feet (ft) | Millimeters (mm) |
|---|---|
| 1 | 304.8 |
| 2 | 609.6 |
| 3 | 914.4 |
| 5 | 1,524 |
| 10 | 3,048 |
| 20 | 6,096 |
| 50 | 15,240 |
| 100 | 30,480 |
| 500 | 152,400 |
| 1,000 | 304,800 |
The formula
To convert feet to millimeters, multiply the length in feet by 304.8:
millimeters = feet × 304.8
A worked example
Convert a 5-foot part length to millimeters:
5 × 304.8 = 1,524 mm
Scaled up, 100 feet is 30,480 mm.
Why it's exact
Since 1959 the foot has been defined as exactly 0.3048 meters, which is exactly 304.8 millimeters. There's no rounding anywhere in the chain.
When you'll use it
Converting product dimensions, CAD drawings, or any imperial measurement that needs to match a millimeter-based spec, which is standard in most manufacturing and engineering work outside the US.
Frequently asked questions
How many millimeters are in a foot?
Exactly 304.8 millimeters. The foot is defined in terms of the meter, so this conversion is exact.
How many millimeters is 10 feet?
10 ft × 304.8 = 3,048 mm.
Why would I convert feet to millimeters instead of centimeters?
Millimeters are the standard unit on engineering and manufacturing drawings, where centimeters aren't typically used. If your spec needs mm precision, convert straight to millimeters.