The imperial pint (≈ 568 ml) is used in the United Kingdom and Ireland and to a limited extent in Commonwealth nations. In the United States, two kinds of pint are used: a liquid pint (≈ 473 ml) and a less-common dry pint (≈ 551 ml). All of the other former British colonies, such as Canada, Australia, South Africa and New Zealand, converted to the metric system in the 1960s and 1970s; so, while the term pint may still be in common use in these countries, it may no longer refer to the British imperial pint once used throughout the British Empire.