Speed
system unit code
(alternative)
abbreviation notes sample
default conversion
combinations
SI m/s m/s m/s US spelling: meter per second
10 m/s (33 ft/s)
  • m/s ft/s (m/s foot/s)
non-SI metric km/h km/h km/h US spelling: kilometer per hour
10 km/h (6,2 mph)
  • km/h mph
Imperial
&
US customary
mph mph mph 10 mph (16 km/h)
  • mph km/h
ft/s ft/s (foot/s) ft/s long code "foot/s" outputs foot per second (and never feet) 10 ft/s (3,0 m/s)
  • ft/s m/s (foot/s m/s)
furlong per fortnight furlong per fortnight (none) 10 furlongs per fortnight (0,0060 km/h; 0,0037 mph)
Maritime units kn kn (knot) kn 10 kn (19 km/h; 12 mph)