The cubic foot equals 28.317 litres exactly. It is used in US HVAC and ventilation (CFM — cubic feet per minute), US natural gas billing, and appliance capacity (refrigerators, freezers). One cubic foot is roughly the volume of a standard shoebox times six.
Real-world: A typical US fridge is 20 cu ft (566 L). US HVAC flow rated in CFM. US residential gas billed per 100 cu ft (CCF).
Read full cubic foot 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 →