What this conversion means in practice
US ceiling heights and lumber in feet need millimeter detail for metric suppliers. One foot is 304.8 mm.
Eight feet is 2,438.4 mm. A 0.125 ft mistake is 38.1 mm, visible in CNC fits.
Feet-inches strings must be one length in feet (or inches) before converting.
How to convert foot to millimeter
Multiply the foot value by 304.8 to get millimeter.
Example: 8 feet × 304.8 = 2,438.4 mm
Foot
Definition: A foot (ft) equals 0.3048 meters exactly.
History and origin: Historically anthropometric, later fixed by international agreement.
Current use: Used in height, building, and aviation altitude reporting.
Millimeter
Definition: A millimeter (mm) equals one-thousandth of a meter.
History and origin: Adopted widely where metric precision is needed without fractions.
Current use: Used in machining, manufacturing, drafting, and tolerancing.
Foot to Millimeter conversion table
| Foot (feet) | Millimeter (mm) |
|---|---|
| 0.1 feet | 30.48 mm |
| 1 feet | 304.8 mm |
| 2 feet | 609.6 mm |
| 3 feet | 914.4 mm |
| 5 feet | 1,524 mm |
| 10 feet | 3,048 mm |
| 20 feet | 6,096 mm |
| 50 feet | 15,240 mm |
| 100 feet | 30,480 mm |
| 1,000 feet | 304,800 mm |
Foot to Millimeter FAQ
feet to mm for metric procurement and machine shops.
How many mm is 6 ft?
1,828.8 mm.
Centimeters?
Multiply feet by 30.48 for cm.
Survey foot?
This page uses the international foot (304.8 mm).