
The Metric System of Measurement
category 
units and metric relationship 
length 
10 millimetres [mm] 
= 
1 centimetre 

10 centimetres [cm] 
= 
1 decimetre 

10 decimetres [dm] 
= 
1 metre 

10 metres [m] 
= 
1 decametre 

10 decametres [dam] 
= 
1 hectometre 

10 hectometres [hm] 
= 
1 kilometre 

1000 metres [m] 
= 
1 kilometre [km] 

area 
100 square mm 
= 
1 square cm 

10 000 square cm 
= 
1 square metre 

100 square metres 
= 
1 are 

100 ares 
= 
1 hectare 

10 000 square metres 
= 
1 hectares 

100 hectares 
= 
1 square kilometre 

1 000 000 square metres 
= 
1 square kilometre 

Volume 
1000 mm^{3} 
= 
1 cm^{3} 

1000 cm^{3} 
= 
1 dm^{3} 

1000 dm^{3} 
= 
1 m^{3} 

1 000 000 cm^{3} 
= 
1 m^{3} 

Capacity 
10 millilitres 
= 
1 centilitre 

10 centilitres 
= 
1 decilitre 

10 decilitres 
= 
1 litre 

1000 litres 
= 
1 m^{3} 

Mass 
1000 grams 
= 
1 kilogram 

1000 kilograms 
= 
1 tonne 

Note: The difference between volume and capacity is there for historical reasons only 
