A half-gallon of volume contains approximately 1,892.7 millilitres. 3,785.4 millilitres per gallon, 1.892 litres per half-gallon, and 3.785 litres per gallon are the figures.
The volume of one cup is 236.6 millilitres (0.2366 litres). One cubic centimetre equals one millilitre. For international units, millilitres are based on the cubic metre of volume, also known as the metric system. Milliliters are measured in graded plastic or glass cylinders.
In the United States, a gallon equals 231 cubic inches, but in the United Kingdom, it equals 277.42 cubic inches. Milk, gasoline, juice, and bottled water are examples of commodities measured in gallons.