Units of mass

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Mesopotamian weights made of hematite.

The mass is a physical magnitude that measures the amount of matter contained in a body. In the International System of Units, the official unit of mass is the kilogram. In the cgs system it is the gram.

Units of the International System of Units (SI)

  • Teragram 1012 g (Tg)
  • Gigagram 109 (Gg)
  • Megagram or Metric Ton 106 (Mg or t)
  • Fifth metric 105 (q)
  • Kilogram 103 g (kg)
  • Hectogram 102 g (hg)
  • Decagram 101 g (dag)
  • gram, 1 g (g)
  • decigram, 10−1 (dg)
  • centigram, 10−2 g (cg)
  • milligram, 10−3 (mg)
  • microgram, 10−6 g (μg)
  • nanogram, 10−9 g (ng)
  • picogram, 10−12 g (pg)
  • femtogram, 10−15 g (fg)
  • attogram, 10−18 g (ag)
  • zeptogram, 10−21 g (zg)
  • Yoctogram, 10−24 (yg)

English system of measurements

In the English system of measurements, the standard unit of mass is the pound.

United Kingdom

  • Long ton or British
  • Long or British Room
  • Long or British
  • Stone
  • Libra avoirdupois
  • Onza avoirdupois
  • Dracma avoirdupois
  • Grano

In the United States

  • Short or American ton
  • Short or American Room
  • Short or American
  • Arroba
  • Libra avoirdupois
  • Onza avoirdupois
  • Dracma avoirdupois
  • Grano

Equivalents in the United States

RoomsQuintalesArrobasLibrasOnionsDracmasGrains
American ton420802,00032,000512,00014,000.000
American Room-5205008,000128,0003,500,000
American Fifth--41001.60025.600700,000
Arroba---254006.400175,000
Libra avoirdupois----162567,000
Onza avoirdupois-----16437.5
Dracma avoirdupois------27,34375

Jewelry units

  • carat (troy): 4 grams metric
  • Metric grain: 50 mg

Units of Jewelery (Anglo-Saxon)

Onzas troyDracmas troyPennyweightGrains
Libra troy12962405.760
Onza troy-820480
Dracma troy--2.560
Pennyweight---24
  • Carat (orfebred) = 4.167 % of precious metal purity.

Gravitational measurement systems

Technical

  • UTM (technical mass unit)

English

  • Slug