Speed of Light to Kilometers per Second Converter
Convert speed of light (c) to kilometers per second (km/s), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter a speed, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 c = 299792.458 km/s
- 1 × 299792.458 = 299792.458 km/s
How to convert speed of light to kilometers per second
1 c = 299,792.458 km/s, so multiply by 299,792.458 to go from speed of light to kilometers per second. Going the other way, 1 km/s = 3.33564095198 × 10⁻⁶ c.
km/s = c × 299,792.458 c = km/s × 3.33564095198
Worked example:
1 c = 299792.458 km/s 5 × 299792.458 = 1498962.29 km/s
Speed of Light to kilometers per second table
| Speed of Light | Kilometers per Second |
|---|---|
| 1 c | 299,792.458 km/s |
| 2 c | 599,584.916 km/s |
| 3 c | 899,377.374 km/s |
| 4 c | 1,199,169.832 km/s |
| 5 c | 1,498,962.29 km/s |
| 6 c | 1,798,754.748 km/s |
| 7 c | 2,098,547.206 km/s |
| 8 c | 2,398,339.664 km/s |
| 9 c | 2,698,132.122 km/s |
| 10 c | 2,997,924.58 km/s |
| 15 c | 4,496,886.87 km/s |
| 20 c | 5,995,849.16 km/s |
| 25 c | 7,494,811.45 km/s |
| 30 c | 8,993,773.74 km/s |
| 40 c | 11,991,698.32 km/s |
| 50 c | 14,989,622.9 km/s |
| 75 c | 22,484,434.35 km/s |
| 100 c | 29,979,245.8 km/s |
| 250 c | 74,948,114.5 km/s |
| 500 c | 149,896,229 km/s |
| 1000 c | 299,792,458 km/s |
About the units
- Speed of Light (c)
- Speed of light, a specialised unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
- Kilometers per Second (km/s)
- Kilometers per second, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).