MOTION
Speed
Linear speed for travel, wind and physics.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result299792 km/s1 c = 299792 km/s
EVERYDAY · ENGINEERING · SCIENCE
c to km/s Converter
Convert speed of light in vacuum (c) to kilometre per second (km/s). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through metre per second
Enter a speed of light in vacuum value to calculate kilometre per second with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| metre per secondfrom c | m/s | 299792000 |
| centimetre per secondfrom c | cm/s | 29979200000 |
| foot per secondfrom c | ft/s | 983571000 |
| kilometre per hourfrom c | km/h | 1079250000 |
| mile per hourfrom c | mph | 670617000 |
| knotfrom c | kn | 582750000 |
| kilometre per secondfrom c | km/s | 299792 |
| speed of light in vacuumfrom c | c | 1 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
c to km/s Conversion Reference
Speed Of Light In Vacuum (c) and kilometre per second (km/s) are units of speed. Use this page to convert in either direction.
Conversion Examples
| Speed Of Light In Vacuum (c) | Kilometre Per Second (km/s) |
|---|---|
| 1 c | 299792 km/s |
| 5 c | 1498960 km/s |
| 10 c | 2997920 km/s |
| 100 c | 29979200 km/s |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
km/s to c (kilometre per second to speed of light in vacuum)
Related Speed Conversions
c to m/s (speed of light in vacuum to metre per second)c to cm/s (speed of light in vacuum to centimetre per second)c to ft/s (speed of light in vacuum to foot per second)c to km/h (speed of light in vacuum to kilometre per hour)c to mph (speed of light in vacuum to mile per hour)c to kn (speed of light in vacuum to knot)