Convert Feet to Millimeters
1 foot (ft) equals 304.8 millimeters (mm).
1 ft = 304.8 mm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot to millimeter converter to paste a column from Excel.
How to Convert Foot to Millimeter
- 1 ft = 304.8 mm
- 1 mm = 0.003280839895 ft
- Example: convert 15 ft to mm: 15 ft = 15 × 304.8 mm = 4572 mm
Reference conditions. ft: The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.
Formula
mm = ft × 304.8
Derivation from SI units:
- 1 ft = 12 in = 0.3048 m (exact)
- 1 mm = 10⁻³ m
- 1 ft = 0.3048 m ÷ 0.001 m per mm = 304.8 mm
Both units are defined exactly, so the factor is exact. Foot definition: foot; Millimeter definition: millimeter.
Worked examples
- A reading of 6 ft converts to 1828.8 mm.
6 ft × 304.8 = 1828.8 mm - A value of 30 ft is 9144 mm.
30 ft × 304.8 = 9144 mm
Foot to Millimeter conversion table
| Feet (ft) | Millimeters (mm) |
|---|---|
| 0.5 ft | 152.4 mm |
| 1 ft | 304.8 mm |
| 2 ft | 609.6 mm |
| 3 ft | 914.4 mm |
| 4 ft | 1219.2 mm |
| 5 ft | 1524 mm |
| 5.5 ft | 1676.4 mm |
| 6 ft | 1828.8 mm |
| 8 ft | 2438.4 mm |
| 10 ft | 3048 mm |
| 12 ft | 3657.6 mm |
| 15 ft | 4572 mm |
| 20 ft | 6096 mm |
| 25 ft | 7620 mm |
| 30 ft | 9144 mm |
| 50 ft | 15240 mm |
| 100 ft | 30480 mm |
| 500 ft | 152400 mm |
| 1000 ft | 304800 mm |
| 5280 ft | 1609344 mm |
| 10000 ft | 3048000 mm |
| 35000 ft | 10668000 mm |
Where it's used
Feet are used for building dimensions and ceiling heights in the US, while millimeters appear in engineering drawings and machining tolerances. Both measure length and distance, so the conversion is a fixed factor.
Foot to other length units
| Conversion | 1 ft equals |
|---|---|
| foot to meter | 0.3048 m |
| foot to kilometer | 0.0003048 km |
| foot to centimeter | 30.48 cm |
| foot to millimeter | 304.8 mm |
| foot to micrometer | 304800 µm |
| foot to nanometer | 304800000 nm |
| foot to angstrom | 3048000000 Å |
| foot to mile | 0.0001893939394 mi |
| foot to yard | 0.3333333333 yd |
| foot to inch | 12 in |
| foot to mil | 12000 mil |
| foot to nautical mile | 0.0001645788337 nmi |
Frequently asked questions
How many millimeters are in 1 foot?
1 ft = 304.8 mm.
How do I convert feet to millimeters?
Multiply the value in ft by 304.8. For example, 15 ft × 304.8 = 4572 mm.
Is the ft to mm conversion exact?
Yes. Both units are defined exactly, and 1 ft is exactly 304.8 mm.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot (ft)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Feet to Millimeters. Retrieved October 17, 2026, from https://scientificconverters.com/length/feet-to-millimeters/
IEEE
Scientific Converters, "Convert Feet to Millimeters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/feet-to-millimeters/