How many kilometers per hour are in 1 mile per hour?

1 mile per hour equals 1.60934 kilometers per hour.

How do I convert miles per hour to kilometers per hour?

Multiply the mile per hour value by 1.60934. So x mph × 1.60934 = the equivalent in km/h.

What is 5 miles per hour in kilometers per hour?

5 miles per hour equals 8.04672 kilometers per hour.

What is 10 miles per hour in kilometers per hour?

10 miles per hour equals 16.0934 kilometers per hour.

What is 100 miles per hour in kilometers per hour?

100 miles per hour equals 160.934 kilometers per hour.

How do I convert back from kilometers per hour to miles per hour?

Multiply the kilometer per hour value by 0.621371. For example, 1 km/h = 0.621371 mph.

Is the mile per hour bigger than the kilometer per hour?

Yes. 1 mile per hour is larger than 1 kilometer per hour — specifically 1.60934 times larger.

Are these conversion factors exact?

Yes. Since the 1959 international yard and pound agreement, imperial/US units are defined exactly in terms of metric units, so the factor used here (1.60934) is exact within IEEE 754 double precision.

25 Miles per hour to Kilometers per hour

25 mph = 40.2336 km/h

25 miles per hour (mph) equals 40.2336 kilometers per hour (km/h). The conversion uses the exact factor 1.60934: 25 × 1.60934 = 40.2336.

From

40.2336

FormulaKilometers per hour = Miles per hour × 1.60934

Quick

How to convert miles per hour to kilometers per hour

Take your value
Start with your value in miles per hour.
Multiply by 1.60934
Multiply the mile per hour value by 1.60934. This is the exact conversion factor from miles per hour to kilometers per hour.
Read the result
The product is your value in kilometers per hour. For example, 5 mph × 1.60934 = 8.04672 km/h.

Conversion formula

The exact factor from miles per hour to kilometers per hour is 1.60934.

Kilometers per hour = Miles per hour × 1.60934

Miles per hour to Kilometers per hour conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from miles per hour to kilometers per hour
Miles per hour (mph)	Kilometers per hour (km/h)
1 mph	1.6093 km/h
2 mph	3.2187 km/h
3 mph	4.828 km/h
4 mph	6.4374 km/h
5 mph	8.0467 km/h
6 mph	9.6561 km/h
7 mph	11.265 km/h
8 mph	12.875 km/h
9 mph	14.484 km/h
10 mph	16.093 km/h
12 mph	19.312 km/h
15 mph	24.14 km/h
18 mph	28.968 km/h
20 mph	32.187 km/h
22 mph	35.406 km/h
25 mph	40.234 km/h
28 mph	45.062 km/h
30 mph	48.28 km/h
32 mph	51.499 km/h
35 mph	56.327 km/h
40 mph	64.374 km/h
45 mph	72.42 km/h
50 mph	80.467 km/h
55 mph	88.514 km/h
60 mph	96.561 km/h
65 mph	104.61 km/h
70 mph	112.65 km/h
75 mph	120.7 km/h
80 mph	128.75 km/h
85 mph	136.79 km/h
90 mph	144.84 km/h
95 mph	152.89 km/h
100 mph	160.93 km/h
110 mph	177.03 km/h
120 mph	193.12 km/h
130 mph	209.21 km/h
140 mph	225.31 km/h
150 mph	241.4 km/h
160 mph	257.5 km/h
180 mph	289.68 km/h
200 mph	321.87 km/h
220 mph	354.06 km/h
250 mph	402.34 km/h
280 mph	450.62 km/h
300 mph	482.8 km/h
350 mph	563.27 km/h
400 mph	643.74 km/h
500 mph	804.67 km/h
700 mph	1126.5 km/h
1000 mph	1609.3 km/h

Real-world reference

US Interstate speed limits are usually 65–75 mph. A 4-minute mile is exactly 15 mph. In kilometers per hour, that gives you: 1 mph = 1.60934 km/h, 10 mph = 16.0934 km/h, 100 mph = 160.934 km/h.

Frequently asked questions

How many kilometers per hour are in 1 mile per hour?: 1 mile per hour equals 1.60934 kilometers per hour.
How do I convert miles per hour to kilometers per hour?: Multiply the mile per hour value by 1.60934. So x mph × 1.60934 = the equivalent in km/h.
What is 5 miles per hour in kilometers per hour?: 5 miles per hour equals 8.04672 kilometers per hour.
What is 10 miles per hour in kilometers per hour?: 10 miles per hour equals 16.0934 kilometers per hour.
What is 100 miles per hour in kilometers per hour?: 100 miles per hour equals 160.934 kilometers per hour.
How do I convert back from kilometers per hour to miles per hour?: Multiply the kilometer per hour value by 0.621371. For example, 1 km/h = 0.621371 mph.
Is the mile per hour bigger than the kilometer per hour?: Yes. 1 mile per hour is larger than 1 kilometer per hour — specifically 1.60934 times larger.
Are these conversion factors exact?: Yes. Since the 1959 international yard and pound agreement, imperial/US units are defined exactly in terms of metric units, so the factor used here (1.60934) is exact within IEEE 754 double precision.

About the mile per hour and the kilometer per hour

The mile per hour

The mile per hour (mph) is the customary speed unit in the United States and the United Kingdom. The conversion 1 mph = 0.44704 m/s is exact, derived from 1 mile = 1609.344 m. A useful mental shortcut: multiply mph by 1.6 to get a close km/h estimate.

The kilometer per hour

The kilometer per hour (km/h) is the standard speed unit on road signs almost everywhere except the United States and the United Kingdom. To convert to meters per second, divide by 3.6 (since 1 km = 1000 m and 1 h = 3600 s).

Kilometers per hour to Miles per hour

km/h → mph

Meters per second to Kilometers per hour

m/s → km/h

Meters per second to Miles per hour

m/s → mph

Meters per second to Knots

m/s → kn

Kilometers per hour to Meters per second

km/h → m/s

Kilometers per hour to Knots

km/h → kn