# Miles per Hour to Kilometers per Second Converter

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

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

Do you want to convert kilometers per second to miles per hour?

## How to Convert Miles per Hour to Kilometers per Second

To convert a measurement in miles per hour to a measurement in kilometers per second, multiply the speed by the following conversion ratio: 0.000447 kilometers per second/mile per hour.

Since one mile per hour is equal to 0.000447 kilometers per second, you can use this simple formula to convert:

kilometers per second = miles per hour × 0.000447

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

For example, here's how to convert 5,000 miles per hour to kilometers per second using the formula above.
kilometers per second = (5,000 mph × 0.000447) = 2.2352 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.

## What Are Miles per Hour?

Miles per hour are a measurement of speed expressing the distance traveled 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 = dmi / thr

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

## What Are Kilometers per Second?

Kilometers per second are a measurement of speed expressing the distance traveled 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.

In the expressions of units, the slash, or solidus (/), is used to express a change in one or more units relative to a change in one or more other units. For example, km/s is expressing a change in length or distance relative to a change in time.

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

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

## Mile per Hour to Kilometer per Second Conversion Table

Table showing various mile per hour measurements converted to kilometers per second.
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
20 mph 0.008941 km/s
30 mph 0.013411 km/s
40 mph 0.017882 km/s
50 mph 0.022352 km/s
60 mph 0.026822 km/s
70 mph 0.031293 km/s
80 mph 0.035763 km/s
90 mph 0.040234 km/s
100 mph 0.044704 km/s
200 mph 0.089408 km/s
300 mph 0.134112 km/s
400 mph 0.178816 km/s
500 mph 0.22352 km/s
600 mph 0.268224 km/s
700 mph 0.312928 km/s
800 mph 0.357632 km/s
900 mph 0.402336 km/s
1,000 mph 0.44704 km/s
2,000 mph 0.89408 km/s
3,000 mph 1.3411 km/s
4,000 mph 1.7882 km/s
5,000 mph 2.2352 km/s
6,000 mph 2.6822 km/s
7,000 mph 3.1293 km/s
8,000 mph 3.5763 km/s
9,000 mph 4.0234 km/s
10,000 mph 4.4704 km/s

## References

1. Wikipedia, Miles per hour, https://en.wikipedia.org/wiki/Miles_per_hour
2. National Institute of Standards and Technology, NIST Guide to the SI, Chapter 6: Rules and Style Conventions for Printing and Using Units, https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-6-rules-and-style-conventions-printing-and-using