The cubic inch equals 16.387 cubic centimetres. Used in US automotive engineering for engine displacement (e.g., "350 cubic inch V8 = 5.7 L") and in firearms (bullet cartridges). Most of the rest of the world uses cc or litres.
Real-world: 350 cu in V8 = 5.7 L engine. 302 cu in Ford V8 = 4.9 L. Modern specs typically give litres.
Read full cubic inch reference →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 →