Feet to Millimetres Converter
Convert feet to millimetres — one foot is exactly 304.8 mm. Results update as you type; exact factors shown.
One foot is 304.8 millimetres — see the exact factor, not a rounded rule of thumb.
How the feet to millimetres converter works
Every length is converted through the metre, 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 UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common length conversions
| From | To | Units |
|---|---|---|
| 0.5 ft | 152.4 mm | feet to millimetres |
| 1 ft | 304.8 mm | foot to millimetres |
| 2 ft | 609.6 mm | feet to millimetres |
| 3 ft | 914.4 mm | feet to millimetres |
| 4 ft | 1,219.2 mm | feet to millimetres |
| 6 ft | 1,828.8 mm | feet to millimetres |
| 8 ft | 2,438.4 mm | feet to millimetres |
| 10 ft | 3,048 mm | feet to millimetres |
| 12 ft | 3,657.6 mm | feet to millimetres |
| 20 ft | 6,096 mm | feet to millimetres |
| 50 ft | 15,240 mm | feet to millimetres |
| 100 ft | 30,480 mm | feet to millimetres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metres |
|---|---|---|
| millimetre | mm | 0.001 metre |
| centimetre | cm | 0.01 metre |
| metre | m | 1 metre |
| kilometre | km | 1,000 metre |
| inch | in | 0.0254 metre |
| foot | ft | 0.3048 metre |
| yard | yd | 0.9144 metre |
| mile | mi | 1,609.344 metre |
| nautical mile | nmi | 1,852 metre |
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 millimetres 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 Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.