The cubic meter (m³) is the SI base unit of volume, representing the space occupied by a cube one meter on each side, used in construction, shipping, and industrial processes. Water supply bills, concrete orders, and freight calculations all rely on cubic meters as their standard measurement. One cubic meter equals exactly 1,000 liters or about 264.2 US gallons.

The UK gallon (imperial gallon) equals exactly 4.54609 liters, about 20% larger than the US gallon, and remains the standard fuel measurement in the United Kingdom and some Commonwealth nations. British fuel efficiency is expressed in miles per imperial gallon, which yields higher numbers than the US equivalent. One UK gallon equals approximately 1.201 US gallons.