Miles per Hour to Kilometers per Hour Converter

How to convert miles per hour to kilometers per hour

kilometers per hour = miles per hour × 1.609344

1 mph is exactly 1.609344 km/h (0.44704 m/s). 1 km/h is 1,000 meters per 3,600 seconds.

The factor 1.609344 is exact, not a rounded value. Nothing is rounded until you choose how many decimals to show.

Worked example: 70 mph

1. Start with the value in miles per hour: 70 mph.
2. Multiply by 1.609344, because 1 mile per hour = 1.609344 kilometers per hour: 70 × 1.609344 = 112.65408 km/h.
3. Round to the precision you need: 112.65 km/h to two decimals.

Miles per Hour and kilometers per hour side by side

Miles per Hour to kilometers per hour chart

Print chart

Miles per hour from 5 to 200 converted to kilometers per hour with the exact factor, shown to five significant digits.

Miles per Hour to kilometers per hour, part 1 of 2

mph	km/h
5	8.0467
10	16.093
15	24.14
20	32.187
25	40.234
30	48.28
35	56.327
40	64.374
45	72.42
50	80.467
55	88.514
60	96.561
65	104.61
70	112.65
75	120.7
80	128.75
85	136.79
90	144.84
95	152.89
100	160.93

Miles per Hour to kilometers per hour, part 2 of 2

mph	km/h
105	168.98
110	177.03
115	185.07
120	193.12
125	201.17
130	209.21
135	217.26
140	225.31
145	233.35
150	241.4
155	249.45
160	257.5
165	265.54
170	273.59
175	281.64
180	289.68
185	297.73
190	305.78
195	313.82
200	321.87

kilometers per hour = miles per hour × 1.609344. Factors: NIST SP 811. unitcheck.net/speed/miles-per-hour-to-kilometers-per-hour/

Going the other way? Use the Kilometers per Hour to Miles per Hour converter.