1 ft = 304.8 mm (foot → millimeter)
1 ft = 304.8 mm
1 foot equals 304.8 millimeters. To convert feet to millimeters, multiply the foot value by 304.8. For quick reference: 1 ft = 304.8 mm, 5 ft = 1524 mm, 10 ft = 3048 mm, 100 ft = 30480 mm.
Millimeters = Feet × 304.8Feet to millimetres multiplies by 304.8 exactly (1 ft = 0.3048 m). An 8 ft sheet of plywood is 2438.4 mm long; a 10 ft length of conduit is 3048 mm. This is the conversion every metric workshop performs on US-spec building materials, since metric shop drawings dimension in whole millimetres. Watch feet-and-inches inputs: 6 ft 6 in is 6.5 ft = 1981.2 mm, and treating the 6 inches as a decimal (6.6 ft) adds a 30 mm error — enough to ruin a door frame.
CNC machine shops importing an American blueprint dimensioned entirely in feet-and-inches have to convert the whole drawing to millimetres before the machine's control software will accept it. A 6 ft structural member becomes 1828.8 mm, and because CNC tolerances are typically held to a tenth of a millimetre, the conversion has to run through the full decimal, not a rounded 1829 mm, when the part feeds into an assembly with other metric components. Convert the entire drawing in one pass rather than piecemeal to avoid compounding rounding errors across a multi-part assembly.
Start with your value in feet.
Multiply the foot value by 304.8. This is the exact conversion factor from feet to millimeters.
The product is your value in millimeters. For example, 5 ft × 304.8 = 1524 mm.
The exact factor from feet to millimeters is 304.8.
Millimeters = Feet × 304.8
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Feet (ft) | Millimeters (mm) |
|---|---|
| 0.1 ft | 30.48 mm |
| 0.25 ft | 76.2 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 |
| 6 ft | 1828.8 mm |
| 7 ft | 2133.6 mm |
| 8 ft | 2438.4 mm |
| 9 ft | 2743.2 mm |
| 10 ft | 3048 mm |
| 11 ft | 3352.8 mm |
| 12 ft | 3657.6 mm |
| 13 ft | 3962.4 mm |
| 14 ft | 4267.2 mm |
| 15 ft | 4572 mm |
| 16 ft | 4876.8 mm |
| 18 ft | 5486.4 mm |
| 20 ft | 6096 mm |
| 22 ft | 6705.6 mm |
| 24 ft | 7315.2 mm |
| 25 ft | 7620 mm |
| 28 ft | 8534.4 mm |
| 30 ft | 9144 mm |
| 32 ft | 9753.6 mm |
| 36 ft | 10973 mm |
| 40 ft | 12192 mm |
| 45 ft | 13716 mm |
| 48 ft | 14630 mm |
| 50 ft | 15240 mm |
| 60 ft | 18288 mm |
| 70 ft | 21336 mm |
| 75 ft | 22860 mm |
| 80 ft | 24384 mm |
| 90 ft | 27432 mm |
| 100 ft | 30480 mm |
| 125 ft | 38100 mm |
| 150 ft | 45720 mm |
| 200 ft | 60960 mm |
| 250 ft | 76200 mm |
| 300 ft | 91440 mm |
| 400 ft | 121920 mm |
| 500 ft | 152400 mm |
| 600 ft | 182880 mm |
| 750 ft | 228600 mm |
| 800 ft | 243840 mm |
| 900 ft | 274320 mm |
| 1000 ft | 304800 mm |
The average adult man in the US is about 5 ft 9 in tall. A standard interior ceiling is around 8 ft high. An NBA basketball hoop is 10 ft above the floor. In millimeters, that gives you: 1 ft = 304.8 mm, 10 ft = 3048 mm, 100 ft = 30480 mm.
The foot (ft) is a unit of length in the imperial and US customary systems, defined as exactly 0.3048 meters (12 inches). It is the everyday unit for human height, room sizes, and short distances in the United States. Five-thousand-two-hundred-and-eighty feet make one mile.
The millimeter (mm) is a metric unit of length equal to one-thousandth of a meter. It is the working unit of engineering drawings, precision manufacturing, electronics, and most consumer-goods specifications outside the United States. A credit card is about 0.76 mm thick; the diameter of a pencil lead is around 2 mm.
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