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Malta
pre-metric units of mass

								tunnellata
								peżata	~4.2667
							qantar	3	12.8
						wiżna	20	60	256
					qsima	4	80	240	1024
				ratal	1¼	5	100	300	1,280
			kwart	4	5	20	400	1200	5120
		uqija	7½	30	37½	150	3,000	9,000	38,400
	kwart	4	30	120	150	600	12,000	36,000	153,600
ottav	2	8	60	240	300	1200	24,000	72,000	307,200
0.117 oz av	0.233 oz av	0.933 oz av	7 oz av	28 oz av	35 oz av	8.750 lbs av	175 lbs av	525 lbs av	2,240 lbs av
3.3 g	6.6 g	26.46 g	198.4 g	793.8 g	992.2 g	3.969 kg	79.38 kg	238.1 kg	1016.05 kg

Note the two kwarti. Some of these units may be largely legal fictions, seldom employed in practice.

At least as early as 1840 the qantar was treated commercially as equal to 175 pounds avoirdupois. In 1921 all surviving units were defined legally by British equivalents.

In the Italian period there were two versions of the ratal (or, to give it its Italian name, the rotolo), in the ratio 30:33, which is the number of onces to two different rotoli. Sicily also had two such rotoli. Using the Italian names, this leads to:

													tonnellata
												pesata	125/33
										light pesata*		1.1	4 1/6
									cantaro grosso		30/11	3	11 4/11
							cantaro or quintale			1.1	3	3.3	12½
								pesa	20	22	60	66	250
						rotolo grosso		50/11	1000/11	100**	272 8/11	300	1136 12/33
						rotolo	1.1	5	100	110	300	330	1250
				libbra		2½	2¾	12½	250	275	750	825	3125
				oncia	12	30	33	150	3,000	3,300	9000	9900	37,500
		dramma		8	96	240	264	1200	24,000	26,400	72,000	79,200	3,000,000
	scrupolo		3	24	288	720	792	3600	72,000	79,200	216,000	237,600	9,900,000
	acino	20	60	480	5760	14,400	15,840	72,000	1,440,000	1,584,000	4,320,000	4,752,000	198,000,000
Doursther				26.383		791.50	870.65			87.07
Board of Trade (1910)								3.969 kg
Martini (1883)	55 mg	1.102 g	3.307 g	26.460 g	317.515 g	793.787 g			79.3787 kg		238.136 kg	261.950 kg	992.234 kg

* Martini says that the pesata of 300 rotoli was (only?) used for retail sales of firewood; the usual pesata was 330 rotoli.

** Nelkenbrecher (1820, page 206) speaks of a “schwere Quintal” (“heavy quintale”) of 111 rotoli each of 2¾ libbre (that is, 111 rotoli grossi). This is almost certainly a scribal error. Universal Commerce (London, 1818, page 167) states: “Cheese, fish, hides and salted provisions are sold by the great cantar which consists of 110 rotolo.”

For precious metals, pearls, gemstones, etc.

During the Italian period precious metals were weighed with this system:

									cantaro
								pesa	20
							rotolo	5	100
						lira	2.5	12.5	250
					oncia	12	30	150	3000
				quarta	4	48	120	600	12000
			octavo	2	8	96	240	1200	24,000
	sedicesimo		2	4	16	192	480	2400	48,000
	trapeso	2	4	8	32	384	960	4800	96,000
coccia	18	36	72	144	576	6912	17,280	86,400	1,728,000
45.8 mg	0.8245 g	1.65 g	3.30 g	6.60 g	26.385 g	316.6 g	791.5 g	3.96 kg	79.15 kg

Doursther (1840) pages 87, 105, 226, 369, 562.

Robert Montgomery Martin.
History of the Colonies of the British Empire in the West Indies, South America, North America, Asia...
London: W. H. Allen & Co. and George Routledge, 1843.

Page 586.

Malta pre-metric units of mass

For precious metals, pearls, gemstones, etc.

Malta
pre-metric units of mass