Speed of light (c)

A unit of speed.

Symbol: c
System: SI
Category: Speed
Exact?: Yes

Definition source: NIST: c = 299 792 458 m/s exact.

Also written as: c, lightspeed, speed of light

Common conversions from c

1 c = 299,792,458 m/s

Speed of light → Meter per second

1 c = 1,079,252,848.8 km/h

Speed of light → Kilometer per hour

1 c = 670,616,629.38 mph

Speed of light → Mile per hour

1 c = 983,571,056.43 ft/s

Speed of light → Foot per second

1 c = 582,749,918.36 kn

Speed of light → Knot

1 c = 874,030.49 Ma

Speed of light → Mach (at sea level)

1 c = 29,979,245,800 cm/s

Speed of light → Centimeter per second