Kilometers Per Hour to Miles Per Hour

One kilometer per hour equals 0.621371 miles per hour.

Miles Per Hour = kilometers per hour ÷ 1.609344

Speed Conversion

From

Common Speeds

Speed Reference Guide

Common Speed Units

Meters per Second (m/s): SI base unit for speed

Kilometers per Hour (km/h): Common metric unit

Miles per Hour (mph): Imperial unit used in US/UK

Feet per Second (ft/s): Imperial unit for technical use

Knots: Nautical speed (1 knot = 1 nautical mile/hour)

Mach: Speed relative to sound (343 m/s at sea level)

Speed Comparisons

Human walking: ~5 km/h (3.1 mph)

Bicycle: ~20 km/h (12.4 mph)

Car (city): ~50 km/h (31 mph)

Car (highway): ~120 km/h (75 mph)

Commercial jet: ~900 km/h (560 mph)

Sound: 1,235 km/h (767 mph)

Kilometers Per Hour to Miles Per Hour Conversion Table

km/h	mph
10	6.2137
20	12.4274
30	18.6411
40	24.8548
50	31.0686
60	37.2823
70	43.496
80	49.7097
90	55.9234
100	62.1371
110	68.3508
120	74.5645
130	80.7783
150	93.2057
200	124.2742

About This Conversion

Kilometers per hour to miles per hour is the conversion drivers need when crossing between metric and imperial road systems. The factor is the same 1.609344 that relates the distances, because both units share the same hour.

The speed limits themselves reveal the rounding conventions each country chose. 50 km/h is 31 mph against a UK 30 mph limit, 100 km/h is 62 mph, and 120 km/h is 75 mph. None of the common metric limits converts to a round imperial number, which is why signs are set independently rather than converted.