Glossary: Mass (weight) Units

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Mass (weight) Units

The Metric System of Measurements uses the mass units: gram (g), kilogram (kg) and tonne (t).

1000 g = 1 kg

1000 kg = 1 tonne

Adding prefixes of the International System of Units (SI) allows to express weight as multiples or fractions of 1 gram:

1 gigatonne	(Gt)	=1 000 000 000 000 000 g
1 megatonne	(Mt)	=1 000 000 000 000 g
1 tonne	(t)	=1 000 000 g
1 kilogram	(kg)	=1 000 g
1 gram	(g)	=1 g
1 milligram	(mg)	=0.001 g
1 microgram	(µg)	=0.000 001 g
1 nanogram	(ng)	=0.000 000 001 g
1 picogram	(pg)	=0.000 000 000 001g

Imperial and US weight units can also be expressed as metric units:

Metric units
1 US ton	(ton)	=0.907 tonne
1 UK ton	(ton)	=1.016 tonne
1 lb	(pound)	=453.59 g
1 oz	(ounce)	=28.35g

Further information on the International System of Units (SI) is provided by the International Bureau of Weights and Measures (BIPM) www.bipm.org/en/si/