Kilometers Per Second to Speed Of Light Conversion

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

Results in Speed Of Light:
Loading content.
1 km/s = 3.3356E-6 c

How to Convert Kilometers Per Second to Speed Of Light

Speedometers are used in vehicles to measure speed

To convert a kilometer per second measurement to a speed of light measurement, multiply the speed by the conversion ratio. One kilometer per second is equal to 3.3356E-6 speed of light, so use this simple formula to convert:

speed of light = kilometers per second × 3.3356E-6

The speed in speed of light is equal to the kilometers per second multiplied by 3.3356E-6.

For example, here's how to convert 500,000 kilometers per second to speed of light using the formula above.
500,000 km/s = (500,000 × 3.3356E-6) = 1.66782 c

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

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.

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.

Kilometer Per Second to Speed Of Light Conversion Table

Kilometer per second measurements converted to speed of light
Kilometers Per Second Speed Of Light
1 km/s 0.0000033356 c
2 km/s 0.0000066713 c
3 km/s 0.000010007 c
4 km/s 0.000013343 c
5 km/s 0.000016678 c
6 km/s 0.000020014 c
7 km/s 0.000023349 c
8 km/s 0.000026685 c
9 km/s 0.000030021 c
10 km/s 0.000033356 c
100 km/s 0.000334 c
1,000 km/s 0.003336 c
10,000 km/s 0.033356 c
100,000 km/s 0.333564 c
1,000,000 km/s 3.3356 c


  1. National Institute of Standards and Technology, SI Redefinition: Meter,