Speed Of Light to Kilometers Per Second Conversion

Enter the speed in speed of light below to get the value converted to kilometers per second.

Results in Kilometers Per Second:
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1 c = 299,792.458 km/s

How to Convert Speed Of Light to Kilometers Per Second

To convert a speed of light measurement to a kilometer per second measurement, multiply the speed by the conversion ratio.

Since one speed of light is equal to 299,792.458 kilometers per second, you can use this simple formula to convert:

kilometers per second = speed of light × 299,792.458

The speed in kilometers per second is equal to the speed of light multiplied by 299,792.458.

For example, here's how to convert 5 speed of light to kilometers per second using the formula above.
5 c = (5 × 299,792.458) = 1,498,962.29 km/s

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

Speed Of Light

The speed of light is equal to exactly 299,792,458 meters per second, or 670,616,629 miles per hour. The definition of the speed of light is actually derived from the most recent 1983 international definition of the meter.[1]

Speed of light can be abbreviated as c; for example, 1 speed of light can be written as 1 c.

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 formal expressions, the slash, or solidus (/), is used to separate units used to indicate division in an expression.[2]

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.

Speed Of Light to Kilometer Per Second Conversion Table

Speed of light measurements converted to kilometers per second
Speed Of Light Kilometers Per Second
0.00001 c 2.9979 km/s
0.00002 c 5.9958 km/s
0.00003 c 8.9938 km/s
0.00004 c 11.99 km/s
0.00005 c 14.99 km/s
0.00006 c 17.99 km/s
0.00007 c 20.99 km/s
0.00008 c 23.98 km/s
0.00009 c 26.98 km/s
0.000001 c 0.299792 km/s
0.00001 c 2.9979 km/s
0.0001 c 29.98 km/s
0.001 c 299.79 km/s
0.01 c 2,998 km/s
0.1 c 29,979 km/s
1 c 299,792 km/s


  1. National Institute of Standards and Technology, SI Redefinition: Meter, https://www.nist.gov/si-redefinition/meter
  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

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