Fathom

Speed

Metres per second, miles per hour, knots, and mach at sea level.

7 units

1 Kilometre per hour = 0.6213711922 Mile per hour (exact)

Quick table

Sample conversions from Kilometre per hour to Mile per hour
Kilometre per hourMile per hour
0.10.06213711922
0.50.3106855961
10.6213711922
21.2427423845
53.106855961
106.213711922
2515.534279806
5031.06855961
10062.13711922

How this system works

A knot is one nautical mile per hour — 1.852 km/h exactly. Mach 1 is not a fixed conversion: it depends on air temperature. Fathom uses the common sea-level value of 340.3 metres per second as a reference, not a law of nature.

Base unit: metre per second. Kilometre per hour is Metric; Mile per hour is US customary.

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