MOTION
Speed
Linear speed for travel, wind and physics.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Resultc → km/hConvert speed of light in vacuum to kilometre per hour
EVERYDAY · ENGINEERING · SCIENCE
Unit conversion. Made clear.
Start with a familiar unit, type a value, and get a dependable answer with sensible precision. Fractions and scientific notation are welcome.
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 hour with full internal precision before display rounding.
Display precisionAuto · 12 significant digits
Auto keeps up to 12 significant digits, trims unnecessary zeroes, and switches to scientific notation for extreme magnitudes.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| metre per secondfrom c | m/s | Interactive |
| centimetre per secondfrom c | cm/s | Interactive |
| foot per secondfrom c | ft/s | Interactive |
| kilometre per hourfrom c | km/h | Interactive |
| mile per hourfrom c | mph | Interactive |
| knotfrom c | kn | Interactive |
| kilometre per secondfrom c | km/s | Interactive |
| speed of light in vacuumfrom c | c | Interactive |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.