How Many Grams are in One Gallon? WebKnox
Grams are units of mass while gallons are units of volume. A liter of water weighs one kilogram, or one thousand grams, and a gallon is liters, so a gallon of water would weigh around 3780 grams. The measurement for how many grams are in a cup depends on what you are measuring. For a cup of confectioners sugar the grams in a cup is 110 grams.