SI Unit Conversions

Mass

1 kilogram (kg) = 1 000 grams (g)

1 gram (g) = 1 000 milligrams (mg)

1 milligram (mg) = 1 000 micrograms (µg)

NOTE: It is better to write the word 'microgram' than to use the symbol 'µg' to avoid misinterpreting with 'mg'.

 

Volume

1 litre (l) = 1 000 millilitres (ml)

 

Length

1 kilometre (km) = 1 000 metres (m)

1 metre (m) = 100 centimetres (cm)

1 centimetre (cm) = 10 millimetres (mm)

 

When using plurals, the 's' is omitted from the symbol, so 820 centimetres is written as 820cm.

  • To convert centimetres to millimetres multiply by 10.
  • To convert millimetres to centimetres divide by 10.
  • To convert metres to centimetres multiply by 100.
  • To convert centimetres to metres divide by 100.
  • To convert kilometres to metres multiply by 1 000.
  • To convert metres to kilometres divide by 1 000.

For help, have another look at Multiplication and Division by 10, 100 and 1000.

Task 22