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  • Units to be display.
    • SPEEDOFLIGHT(), returns the speed of light per year.


  • This function shows the value of speed of light.
  • The speed of light value is  .
  • The approximate value is approximately  .
  • It is exact because the unit of length, the meter, is defined from this constant and the international standard for time.
  • Speed of light is the distance of light which can travel in a unit of time through a given substance.
  • Speed of light in vacuum is denoted by c.
  • The speed at which light propagates through transparent materials, such as glass or air, is less than c.
  • Similarly, the speed of radio waves in wire cables is slower than c.
  • A light year, or the distance light can travel in a year, is over five trillion miles.
  • Light from the sun takes about eight minutes to reach the Earth.
  • Speed of light is mainly used in Einstein's formula  .


  1. SPEEDOFLIGHT("cm") = 29979245800 cm s-1.
  2. SPEEDOFLIGHT("mm") = 299792458000 mm s-1.
  3. SPEEDOFLIGHT("km") = 299792.458 km s-1.

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See Also