Speed of light
Metric
- Kilometre per second299,792.46
- Metre per second299,792,458
- Kilometre per hour1.08×10⁹
- Millimetre per second (mm/s)3×10¹¹
- Micrometre per second (µm/s)3×10¹⁴
British/American
- Mile per second186,282.4
- Mile per hour (mph)670,616,629.38
- Foot per second983,571,056.43
Nautical
- Knot582,749,918.36
Other
- Speed of light1
- Speed of sound874,030.49
- A brisk walk176,348,504.71
- Speed of a common snail3×10¹¹