Convert Feet to Millimeters
1 foot is 304.8 mm. One foot is exactly 304.8 millimeters.
One foot is 304.8 millimeters. To convert feet to millimeters, multiply by 304.8; to go the other way, divide by 304.8 or multiply by 0.0032808399. The factor is exact rather than rounded: it follows from NIST. Twelve inches, or exactly 0.3048 meters.
Factor checked against the defining standard · How we check
- Feet × 304.8
1 * 304.8304.8 mm
1 foot in every length unit
| Unit | Value | Exact factor |
|---|---|---|
| inches | 12 in | × 12 |
| feet (as entered) | 1 ft | — |
| yards | 0.3333333333 yd | × 0.333333333333 |
| miles | 0.0001893939394 mi | × 0.000189393939394 |
| millimeters | 304.8 mm | × 304.8 |
| decimetres | 3.048 dm | × 3.048 |
| centimeters | 30.48 cm | × 30.48 |
| meters | 0.3048 m | × 0.3048 |
| kilometers | 0.0003048 km | × 0.0003048 |
| nautical miles | 0.0001645788337 nmi | × 0.000164578833693 |
| micrometers | 304,800 µm | × 304,800 |
| nanometers | 304,800,000 nm | × 304,800,000 |
| thou | 12,000 thou | × 12,000 |
Factors are entered by hand from NIST rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: feet to millimetres is the British spelling of the same units — the metre and the litre are spelled that way outside the United States and the quantity does not change.
How do you convert feet to millimeters? The converter and the working
- 1.Take the measurement in feet.
- 2.Multiply by 304.8 — that is how many millimeters fit in one foot.
- 3.To go back the other way, divide by 304.8, or multiply by 0.0032808399.
Worked example: 25 feet to millimeters
- Formula
- ft × 304.8 = mm
- Arithmetic
- 25 × 304.8 = 7,620 mm
- Answer
- 25 ft = 7,620 mm
The factor is exact, so this figure is exact too — only the display is rounded.
Feet to millimeters conversion table
| Feet | Millimeters |
|---|---|
| 1 ft | 304.8 mm |
| 2 ft | 609.6 mm |
| 3 ft | 914.4 mm |
| 4 ft | 1,219.2 mm |
| 5 ft | 1,524 mm |
| 6 ft | 1,828.8 mm |
| 7 ft | 2,133.6 mm |
| 8 ft | 2,438.4 mm |
| 9 ft | 2,743.2 mm |
| 10 ft | 3,048 mm |
| 12 ft | 3,657.6 mm |
| 15 ft | 4,572 mm |
| 20 ft | 6,096 mm |
| 25 ft | 7,620 mm |
| 50 ft | 15,240 mm |
| 100 ft | 30,480 mm |
| 200 ft | 60,960 mm |
| 300 ft | 91,440 mm |
| 500 ft | 152,400 mm |
| 1000 ft | 304,800 mm |
| 2000 ft | 609,600 mm |
| 5000 ft | 1,524,000 mm |
| 10000 ft | 3,048,000 mm |
What is a foot?
Twelve inches, or exactly 0.3048 meters. Still the working unit of US construction.
What is a millimeter?
One thousandth of a meter. The working unit of metric engineering drawings, which avoid decimals by using it throughout.
How many millimeters are in a foot?
One foot is 304.8 millimeters, exactly. Going the other way, one millimeter is 0.0032808399 feet. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every length unit here
The whole group — 13 units with their symbols and the size of each one in meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a foot.
Source: NIST — international yard and pound agreement (inch = 25.4 mm exactly)
Cite this page
- APA
- Rule Calculator. (2026). Convert Feet to millimeters. Rule Calculator. https://rulecalculators.com/convert/foot-to-millimeter
- MLA
- "Convert Feet to millimeters." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/foot-to-millimeter.
- Chicago
- Rule Calculator. "Convert Feet to millimeters." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/foot-to-millimeter.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many millimeters are in a foot?
- 304.8. One thousandth of a meter. The working unit of metric engineering drawings, which avoid decimals by using it throughout.
- How do I convert millimeters back to feet?
- Divide by 304.8, or multiply by 0.0032808399 — they are the same operation.
The values people look up
Each one is this page with the value filled in, and each answers in its own title.
Other length conversions
Millimeters to feet — the same conversion the other way.