Mass
system unit unit-
code
symbol or
abbrev.
notes sample
default conversion
combinations
SI kilogram kg kg 1.0 kg (2.2 lb)
  • kg lb
    • kg lb st
  • kg st
    • kg st lb
gram g g 1.0 g (0.035 oz)
  • g oz
milligram mg mg 1.0 mg (0.015 gr)
  • mg gr
microgram μg (ug
or mcg)
μg 1.0 μg (1.5×10−5 gr)
non-SI metric tonne t t 1.0 t (0.98 long tons; 1.1 short tons)
  • t LT
    • t LT ST
  • t ST
    • t ST LT
metric ton MT t
  • MT LT
    • MT LT ST
  • MT ST
    • MT ST LT
Avoirdupois long ton LT (none) 2,240 lb
used mostly in the British Commonwealth except Canada
1.0 long ton (1.0 t)
  • LT t
    • LT t ST
  • LT MT
    • LT MT ST
  • LT ST
    • LT ST t
    • LT ST MT
short ton ST (none) 2,000 lb
used mostly in the US and Canada
1.0 short ton (0.91 t)
  • ST t
    • ST t LT
  • ST MT
    • ST MT LT
  • ST LT
    • ST LT t
    • ST LT MT
long hundredweight long cwt long cwt 1.0 long cwt (110 lb; 51 kg)
short hundredweight short cwt short cwt 1.0 short cwt (100 lb; 45 kg)
long quarter long qtr long qtr 1.0 long qtr (28 lb; 13 kg)
short quarter short qtr short qtr 1.0 short qtr (25 lb; 11 kg)
stone st st 14 lb
used mostly in the British Commonwealth except Canada
1.0 st (14 lb; 6.4 kg)
  • st kg
    • st kg lb
  • st lb
    • st lb kg
pound lb lb 1.0 lb (0.45 kg)
  • lb kg
    • lb kg st
  • lb st
    • lb st kg
ounce oz oz 1.0 oz (28 g)
  • oz g
drachm drachm (none) 1.0 drachm (1.8 g)
drachm dram (none)
grain gr gr equivalent to the troy grain 1.0 gr (0.065 g)
Troy troy pound troy pound (none) 1.0 troy pound (0.82 lb; 0.37 kg)
troy ounce ozt ozt 1.0 ozt (1.1 oz; 31 g)
pennyweight dwt dwt 1.0 dwt (0.055 oz; 1.6 g)
grain gr gr equivalent to the avoirdupois grain 1.0 gr (0.065 g)
other carat carat (none) 1.0 carat (0.20 g)