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/
