Speed of Light (c)

The speed of light in vacuum (c) is exactly 299,792,458 meters per second or approximately 670 million mph. This universal constant is the maximum speed possible in the universe according to Einstein's relativity. Light travels 1 foot in about 1 nanosecond.

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Convert To Speed of Light

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Conversion Factors

1 c 299792458 m/s

1 c 1079252847.9 km/h

1 c 29979245800 cm/s

1 c 670616629.38 mph

1 c 983571056.43 ft/s

1 c 582749918.86 kn

1 c 874030.4898 Mach

Related Units

Meter per Second (m/s) Kilometer per Hour (km/h) Centimeter per Second (cm/s) Mile per Hour (mph) Foot per Second (ft/s) Knot (kn) Mach (Mach)