Convert gallon (imperial) to cubic meter

The UK and the US kept different gallons after 1824. The imperial gallon is 4.546 l and the US gallon 3.785 l, so a US gallon is only five-sixths of a British one; the same applies to their quarts and pints, and a British pint of beer (568 ml, 20 fl oz) is bigger than an American one (473 ml, 16 fl oz). The US also has a separate dry gallon of 4.405 l for grain and produce. Fuel is sold by the litre in Britain today but by the US gallon in America, which matters for fuel-economy figures.

A cubic metre is 1,000 litres, also called a kilolitre on Australian water bills. Water meters count in it: one person uses roughly 45–55 m³ a year. Gas meters count cubic metres too, and the bill converts them to kilowatt-hours at about 10–11 kWh per m³. Removals and freight think in cubic metres as well, a 20-foot container holding 33 m³ and a concrete mixer truck 8 m³. The hectolitre, 100 l, is the unit of brewers and winemakers: breweries report output in hl and vineyards their yields in hl per hectare.