The UK imperial gallon equals 4.54609 litres exactly. Defined in 1824 as the volume of 10 pounds of water at 62 °F. Still used for fuel economy reporting in the UK and some older industrial contexts. The UK imperial gallon is about 20% larger than the US gallon.
Real-world: UK petrol sold by litre since 1995, but economy is quoted in UK mpg: a diesel car at 60 mpg (UK) uses 4.7 L/100 km.
Read full uk gallon reference →The cubic yard equals 0.7646 cubic metres or 27 cubic feet. It is the standard US unit for concrete, gravel, mulch and soil ordering. A typical residential concrete truck delivers 10 cubic yards. US freight shipping also uses cubic yards for loose-material capacity.
Real-world: A residential US concrete pour might need 3–8 cubic yards. US garbage dumpsters rated in cubic yards.
Read full cubic yard reference →