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
non-SI metric	metric ton	MT		t		1.0 t (0.98 long tons; 1.1 short tons)	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)		1.0 drachm (1.8 g)
	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)

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