# Speed Of Light Conversion

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

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 |