Metre

The metre (Commonwealth spelling) or meter (American spelling; see spelling differences) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m.

metre
Seal of the International Bureau of Weights and Measures (BIPM) – Use measure (Greek: ΜΕΤΡΩ ΧΡΩ)
General information
Unit systemSI base unit
Unit ofLength
Symbolm[1]
Conversions
1 m[2] in ...... is equal to ...
   SI units   1000 mm
0.001 km
   Imperial/US units   1.0936 yd

3.2808 ft

39.37 in
   Nautical units   0.00053996 nmi

The metre is currently defined as the length of the path travelled by light in a vacuum in 1/299 792 458 of a second.

The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length.