How many cups are in half a gallon? The quantity dimension unit used in cooking is referred to as the cup. As a result, they are mostly used for cooking and serving sizes. The level is typically bordered by 200 and 250 ml in the US. When calculated using the metric system of amount measurement, this can be estimated to be less than a quarter of a litre. As a result, it appears that a standard cup is used to gauge volumes. Likewise, a gallon is 4 litres, and a half-gallon is roughly 2 litres. A half-gallon will be (2/ ¼ ) cups = 8 cups. Se... More