Convert millimetres to feet
1 mm = 0.00328084 ft
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How many feet are in a millimetre?
One millimetre is 0.0032808399 feet. To convert any amount, multiply by 0.0032808399. Going the other way, one foot is 304.8 millimetres.
What is the formula to convert mm to ft?
Multiply the millimetre figure by 0.0032808399. So ft = mm × 0.0032808399. For a quick mental estimate, dividing by about 304.8 gets you close enough for most everyday purposes.
What does a millimetre actually look like?
One millimetre is roughly the thickness of a credit card, which is 0.76 mm. The millimetre is the working unit of engineering drawings and machining tolerances almost everywhere metric is used, because it avoids decimals for most part dimensions.
And what is a foot?
One foot is about the length of a standard ruler. The foot is exactly 0.3048 metres. It survives in aviation worldwide — altitudes are given in feet almost everywhere, including in fully metric countries.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding mm before converting introduces an error the conversion then multiplies.
About mm to ft
How to convert millimetres to feet
Multiply by 0.0032808399. One millimetre is 0.0032808399 feet, and one foot is 304.8 millimetres.
ft = mm × 0.0032808399
Worked example
10 mm = 0.0328084 ft. For a sense of scale, one millimetre is roughly the thickness of a credit card, which is 0.76 mm, and one foot is about the length of a standard ruler.
About the millimetre
The millimetre is the working unit of engineering drawings and machining tolerances almost everywhere metric is used, because it avoids decimals for most part dimensions.
About the foot
The foot is exactly 0.3048 metres. It survives in aviation worldwide — altitudes are given in feet almost everywhere, including in fully metric countries.
Quick reference
| millimetres | feet |
|---|---|
| 1 mm | 0.00328084 ft |
| 2 mm | 0.00656168 ft |
| 5 mm | 0.0164042 ft |
| 10 mm | 0.0328084 ft |
| 25 mm | 0.082021 ft |
| 50 mm | 0.164042 ft |
| 100 mm | 0.328084 ft |
| 1000 mm | 3.28084 ft |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding mm to a whole number before converting introduces an error that the conversion then multiplies.
Other length conversions
Convert feet back to millimetres, or pick any other pair with the full unit converter. Related: mm to km, mm to m, mm to cm.