Teaching mathematics

1.4 Useful ‘rough’ metric to imperial equivalences

Below is a list of useful ‘rule of thumb’ equivalences between metric and imperial measures.

  • 10 cm is about 4 inches
  • 30 cm is about 12 inches = 1 foot
  • 8 km is about 5 miles
  • A litre of water is a pint and three-quarters.
  • Two and a quarter pounds of jam, weighs about a kilogram.

OpenLearn - Teaching mathematics
ou logoCreative Commons non-commercial share alike icon Except for third party materials and otherwise, this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence, full copyright detail can be found in the acknowledgements section. Please see full copyright statement for details.