Convert Miles Per Hour to Kilometers Per Second

Enter the speed in miles per hour below to get the value converted to kilometers per second.

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Results in Kilometers Per Second:
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1 mph = 0.000447 km/s

How to Convert Miles Per Hour to Kilometers Per Second

Speedometers are used in vehicles to measure speed

To convert a mile per hour measurement to a kilometer per second measurement, multiply the speed by the conversion ratio. One mile per hour is equal to 0.000447 kilometers per second, so use this simple formula to convert:

kilometers per second = miles per hour × 0.000447

The speed in kilometers per second is equal to the miles per hour multiplied by 0.000447.

For example, here's how to convert 5 miles per hour to kilometers per second using the formula above.
5 mph = (5 × 0.000447) = 0.002235 km/s

Miles per hour and kilometers per second are both units used to measure speed. Keep reading to learn more about each unit of measure.

Miles Per Hour

Miles per hour are a measurement of speed expressing the distance travelled in miles in one hour.

The mile per hour is a US customary and imperial unit of speed. Miles per hour can be abbreviated as mph, and are also sometimes abbreviated as mi/h or MPH. For example, 1 mile per hour can be written as 1 mph, 1 mi/h, or 1 MPH.

Miles per hour can be expressed using the formula:
vmph = dmithr

The velocity in miles per hour is equal to the distance in miles divided by time in hours.

Kilometers Per Second

Kilometers per second are a measurement of speed expressing the distance travelled in kilometers in one second.

The kilometer per second, or kilometre per second, is an SI unit of speed in the metric system. Kilometers per second can be abbreviated as km/s, and are also sometimes abbreviated as km/sec. For example, 1 kilometer per second can be written as 1 km/s or 1 km/sec.

Kilometers per second can be expressed using the formula:
vkm/s = dkmtsec

The velocity in kilometers per second is equal to the distance in kilometers divided by time in seconds.

Mile Per Hour Measurements and Equivalent Kilometer Per Second Conversions

Common mile per hour values converted to the equivalent kilometer per second value
Miles Per Hour Kilometers Per Second
1 mph 0.000447 km/s
2 mph 0.000894 km/s
3 mph 0.001341 km/s
4 mph 0.001788 km/s
5 mph 0.002235 km/s
6 mph 0.002682 km/s
7 mph 0.003129 km/s
8 mph 0.003576 km/s
9 mph 0.004023 km/s
10 mph 0.00447 km/s
11 mph 0.004917 km/s
12 mph 0.005364 km/s
13 mph 0.005812 km/s
14 mph 0.006259 km/s
15 mph 0.006706 km/s
16 mph 0.007153 km/s
17 mph 0.0076 km/s
18 mph 0.008047 km/s
19 mph 0.008494 km/s
20 mph 0.008941 km/s
21 mph 0.009388 km/s
22 mph 0.009835 km/s
23 mph 0.010282 km/s
24 mph 0.010729 km/s
25 mph 0.011176 km/s
26 mph 0.011623 km/s
27 mph 0.01207 km/s
28 mph 0.012517 km/s
29 mph 0.012964 km/s
30 mph 0.013411 km/s
31 mph 0.013858 km/s
32 mph 0.014305 km/s
33 mph 0.014752 km/s
34 mph 0.015199 km/s
35 mph 0.015646 km/s
36 mph 0.016093 km/s
37 mph 0.01654 km/s
38 mph 0.016988 km/s
39 mph 0.017435 km/s
40 mph 0.017882 km/s

More Mile Per Hour Speed Conversions

Convert to Knots
1 mph is equal to 0.868976 knots
Convert to Mach
1 mph is equal to Mach 0.001303
Convert to Speed Of Sound
1 mph is equal to 0.001303 speed of sound
Convert to Speed Of Light
1 mph is equal to 1.4912E-9 speed of light
Convert to Feet Per Second
1 mph is equal to 1.466667 feet per second
Convert to Kilometers Per Hour
1 mph is equal to 1.609344 kilometers per hour
Convert to Meters Per Second
1 mph is equal to 0.44704 meters per second
Convert to Centimeters Per Second
1 mph is equal to 44.704 centimeters per second

Unit of Measurement Conversion Made Easy!

There are thousands of units of measure in use across the globe, and converting from one to another can be very difficult since each conversion requires a different formula to derive the result. Our unit of measurement conversion tools are meant to be dead easy. We break the mold of the typical dry and complicated experience. In addition to converting from one measurement to another, we provide the formula so you can see how the conversion is done, use it on you’re own calculator if you need to!

Convert units of length, weight, volume, and area between imperial and metric measures

Understanding the Metric System

The metric system makes it relatively easy to convert from one metric unit to another metric unit. The metric system uses a base unit, think meters or grams, and a prefix such as kilo or milli. The prefixes differ from the base units by differing powers of 10. So to convert within the metric system it’s usually a matter of multiplying or dividing by one of the powers of 10.

Here is a list of some of the common metric prefixes:

  • “kilo” – 1,000x larger
  • “hecto” – 100x larger
  • “deca” – 10x larger
  • “deci” – 10x smaller
  • “centi” – 100x smaller
  • “milli” – 1,000x smaller

There is a helpful mnemonic for remembering the prefixes: “King Henry Died Until Drinking Chocolate Milk.”
The u in Until refers to the base unit.