How Many Ounces In A Gallon

Wondering how many ounces are in a gallon? Maybe you aren’t sure about the volume of the liquid you should be drinking each day to keep your body (and mind) in tip-top shape.

Ounces, or “uncia,” if we want to quote the Romans, is a unit of weight (dry ounce) or a unit of volume (fluid ounce).

The number of ounces in a gallon varies depending on the different countries’ units of measurement

(There are 128oz in 1 gallon of liquid.) To dive deeper, grab a glass of water, and let’s talk gallon measurements, hydration, and more!

Get a free conversion chart here!