Feet to Millimeters Converter
Convert feet to millimeters — one foot is exactly 304.8 mm. Results update as you type; exact factors shown.
One foot is 304.8 millimeters — see the exact factor, not a rounded rule of thumb.
How the feet to millimeters converter works
Every length is converted through the meter, the SI base unit of length. The inch has been defined as exactly 25.4 mm since the 1959 international yard and pound agreement, so a foot is exactly 0.3048 m, a yard 0.9144 m and a statute mile 1,609.344 m. The nautical mile is 1,852 m by international definition.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common length conversions
| From | To | Units |
|---|---|---|
| 0.5 ft | 152.4 mm | feet to millimeters |
| 1 ft | 304.8 mm | foot to millimeters |
| 2 ft | 609.6 mm | feet to millimeters |
| 3 ft | 914.4 mm | feet to millimeters |
| 4 ft | 1,219.2 mm | feet to millimeters |
| 6 ft | 1,828.8 mm | feet to millimeters |
| 8 ft | 2,438.4 mm | feet to millimeters |
| 10 ft | 3,048 mm | feet to millimeters |
| 12 ft | 3,657.6 mm | feet to millimeters |
| 20 ft | 6,096 mm | feet to millimeters |
| 50 ft | 15,240 mm | feet to millimeters |
| 100 ft | 30,480 mm | feet to millimeters |
Units in this converter and their exact factors
| Unit | Symbol | One unit in meters |
|---|---|---|
| millimeter | mm | 0.001 meter |
| centimeter | cm | 0.01 meter |
| meter | m | 1 meter |
| kilometer | km | 1,000 meter |
| inch | in | 0.0254 meter |
| foot | ft | 0.3048 meter |
| yard | yd | 0.9144 meter |
| mile | mi | 1,609.344 meter |
| nautical mile | nmi | 1,852 meter |
FAQFrequently asked questions about length conversion
How many mm in a foot?
Exactly 304.8 mm.
What is 8 feet in mm?
2,438.4 mm.
Why do drawings use mm for imperial sizes?
Because construction dimensions are drawn in millimeters even where materials are sold in feet, so the conversion happens constantly.
What is 6 feet in mm?
1,828.8 mm.
Is the foot exact in metric?
Yes — 0.3048 m exactly, since 1959.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.