Speed Of Light Conversion

Speedometers are used in vehicles to measure speed

The speed of light is a unit used to measure speed. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about speed of light.

Speed Of Light Conversion Calculators

Choose a unit of speed to convert to.

Convert speed of light to knots
1 speed of light is equal to 582,749,918 knots
Convert speed of light to Mach
1 speed of light is equal to 874,030 Mach
Convert speed of light to speed of sound
1 speed of light is equal to 874,030 speed of sound
Convert speed of light to miles per hour
1 speed of light is equal to 670,616,629 miles per hour
Convert speed of light to feet per second
1 speed of light is equal to 983,571,056 feet per second
Convert speed of light to kilometers per second
1 speed of light is equal to 299,792 kilometers per second
Convert speed of light to kilometers per hour
1 speed of light is equal to 1,079,252,849 kilometers per hour
Convert speed of light to meters per second
1 speed of light is equal to 299,792,458 meters per second
Convert speed of light to centimeters per second
1 speed of light is equal to 29,979,245,800 centimeters per second

Speed Of Light Definition and Usage

The speed of light is equal to exactly 299,792,458 meters per second, or 670,616,629 miles per hour.

Speed of light can be abbreviated as c, for example 1 speed of light can be written as 1 c.

Speed Of Light Measurement Conversion Table

Common speed of light values and equivalent imperial and metric speed measurements
speed of light knots Mach speed of sound miles per hour feet per second kilometers per second kilometers per hour meters per second centimeters per second
1 c 582,749,918 kn Mach 874,030 874,030 670,616,629 mph 983,571,056 ft/s 299,792 km/s 1,079,252,849 km/h 299,792,458 m/s 29,979,245,800 cm/s
2 c 1,165,499,837 kn Mach 1,748,061 1,748,061 1,341,233,259 mph 1,967,142,113 ft/s 599,585 km/s 2,158,505,698 km/h 599,584,916 m/s 59,958,491,600 cm/s
3 c 1,748,249,755 kn Mach 2,622,091 2,622,091 2,011,849,888 mph 2,950,713,169 ft/s 899,377 km/s 3,237,758,546 km/h 899,377,374 m/s 89,937,737,400 cm/s
4 c 2,330,999,673 kn Mach 3,496,122 3,496,122 2,682,466,518 mph 3,934,284,226 ft/s 1,199,170 km/s 4,317,011,395 km/h 1,199,169,832 m/s 119,916,983,200 cm/s
5 c 2,913,749,592 kn Mach 4,370,152 4,370,152 3,353,083,147 mph 4,917,855,282 ft/s 1,498,962 km/s 5,396,264,244 km/h 1,498,962,290 m/s 149,896,229,000 cm/s
6 c 3,496,499,510 kn Mach 5,244,183 5,244,183 4,023,699,776 mph 5,901,426,339 ft/s 1,798,755 km/s 6,475,517,093 km/h 1,798,754,748 m/s 179,875,474,800 cm/s
7 c 4,079,249,429 kn Mach 6,118,213 6,118,213 4,694,316,406 mph 6,884,997,395 ft/s 2,098,547 km/s 7,554,769,942 km/h 2,098,547,206 m/s 209,854,720,600 cm/s
8 c 4,661,999,347 kn Mach 6,992,244 6,992,244 5,364,933,035 mph 7,868,568,451 ft/s 2,398,340 km/s 8,634,022,790 km/h 2,398,339,664 m/s 239,833,966,400 cm/s
9 c 5,244,749,265 kn Mach 7,866,274 7,866,274 6,035,549,664 mph 8,852,139,508 ft/s 2,698,132 km/s 9,713,275,639 km/h 2,698,132,122 m/s 269,813,212,200 cm/s
10 c 5,827,499,184 kn Mach 8,740,305 8,740,305 6,706,166,294 mph 9,835,710,564 ft/s 2,997,925 km/s 10,792,528,488 km/h 2,997,924,580 m/s 299,792,458,000 cm/s
11 c 6,410,249,102 kn Mach 9,614,335 9,614,335 7,376,782,923 mph 10,819,281,621 ft/s 3,297,717 km/s 11,871,781,337 km/h 3,297,717,038 m/s 329,771,703,800 cm/s
12 c 6,992,999,020 kn Mach 10,488,366 10,488,366 8,047,399,553 mph 11,802,852,677 ft/s 3,597,509 km/s 12,951,034,186 km/h 3,597,509,496 m/s 359,750,949,600 cm/s
13 c 7,575,748,939 kn Mach 11,362,396 11,362,396 8,718,016,182 mph 12,786,423,734 ft/s 3,897,302 km/s 14,030,287,034 km/h 3,897,301,954 m/s 389,730,195,400 cm/s
14 c 8,158,498,857 kn Mach 12,236,427 12,236,427 9,388,632,811 mph 13,769,994,790 ft/s 4,197,094 km/s 15,109,539,883 km/h 4,197,094,412 m/s 419,709,441,200 cm/s
15 c 8,741,248,775 kn Mach 13,110,457 13,110,457 10,059,249,441 mph 14,753,565,846 ft/s 4,496,887 km/s 16,188,792,732 km/h 4,496,886,870 m/s 449,688,687,000 cm/s
16 c 9,323,998,694 kn Mach 13,984,488 13,984,488 10,729,866,070 mph 15,737,136,903 ft/s 4,796,679 km/s 17,268,045,581 km/h 4,796,679,328 m/s 479,667,932,800 cm/s
17 c 9,906,748,612 kn Mach 14,858,518 14,858,518 11,400,482,700 mph 16,720,707,959 ft/s 5,096,472 km/s 18,347,298,430 km/h 5,096,471,786 m/s 509,647,178,600 cm/s
18 c 10,489,498,530 kn Mach 15,732,549 15,732,549 12,071,099,329 mph 17,704,279,016 ft/s 5,396,264 km/s 19,426,551,278 km/h 5,396,264,244 m/s 539,626,424,400 cm/s
19 c 11,072,248,449 kn Mach 16,606,579 16,606,579 12,741,715,958 mph 18,687,850,072 ft/s 5,696,057 km/s 20,505,804,127 km/h 5,696,056,702 m/s 569,605,670,200 cm/s
20 c 11,654,998,367 kn Mach 17,480,610 17,480,610 13,412,332,588 mph 19,671,421,129 ft/s 5,995,849 km/s 21,585,056,976 km/h 5,995,849,160 m/s 599,584,916,000 cm/s