Speed
system unit code
(alternative)
abbreviation notes conversion factor/(m/s) combinations
SI metre per second m/s m/s US spelling: meter per second
1
  • m/s ft/s (m/s foot/s)
non-SI metric kilometre per hour km/h km/h US spelling: kilometer per hour
(5/18)
  • km/h mph
Imperial
&
US customary
mile per hour mph mph 0.44704
  • mph km/h
foot per second ft/s (foot/s) ft/s The foot/s code will produce foot per second as the plural form. 0.3048
  • ft/s m/s (foot/s m/s)
furlong per fortnight furlong per fortnight (1.397/8,400)
Maritime units knot kn (knot) kn (4.63/9)