Convert miles to millimetres
1 mi = 1609340 mm
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How many millimetres are in a mile?
One mile is 1609344 millimetres. To convert any amount, multiply by 1609344. Going the other way, one millimetre is 6.21371192e-7 miles.
What is the formula to convert mi to mm?
Multiply the mile figure by 1609344. So mm = mi × 1609344. For a quick mental estimate, multiplying by about 1609344 gets you within a percent or so, which is close enough for most everyday purposes.
What does a mile actually look like?
One mile is a comfortable 20-minute walk. The statute mile is exactly 1,609.344 metres, a consequence of the inch being fixed at 25.4 mm in 1959. It remains the road unit in the US and UK.
And what is a millimetre?
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.
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 mi before converting introduces an error the conversion then multiplies.
About mi to mm
How to convert miles to millimetres
Multiply by 1609344. One mile is 1609344 millimetres, and one millimetre is 6.21371192e-7 miles.
mm = mi × 1609344
Worked example
10 mi = 16093440 mm. For a sense of scale, one mile is a comfortable 20-minute walk, and one millimetre is roughly the thickness of a credit card, which is 0.76 mm.
About the mile
The statute mile is exactly 1,609.344 metres, a consequence of the inch being fixed at 25.4 mm in 1959. It remains the road unit in the US and UK.
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.
Quick reference
| miles | millimetres |
|---|---|
| 1 mi | 1609340 mm |
| 2 mi | 3218690 mm |
| 5 mi | 8046720 mm |
| 10 mi | 16093400 mm |
| 25 mi | 40233600 mm |
| 50 mi | 80467200 mm |
| 100 mi | 160934000 mm |
| 1000 mi | 1609340000 mm |
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 mi to a whole number before converting introduces an error that the conversion then multiplies.
Other length conversions
Convert millimetres back to miles, or pick any other pair with the full unit converter. Related: mi to km, mi to m, mi to cm.