A half gallon equals 8 cups. That’s the simple answer whether you’re measuring milk, water, or any liquid ingredient in a recipe.
This guide breaks down the full conversion, plus everyday examples so the numbers actually make sense.
How Many Cups in a Half Gallon?
There are 8 cups in a half gallon. This comes from the basic US measurement system, where 1 gallon equals 16 cups. Cut that in half, and you land on 8.
There are 8 cups of 8 fluid ounces each in a half gallon. This is the standard US measuring cup size — the same one used in most cooking and baking recipes.
Half Gallon in Quarts and Pints
1 quart = 4 cups, so 2 quarts = 8 cups
1 pint = 2 cups, so 4 pints = 8 cups
Half Gallon in Ounces and Liters
A half gallon equals 64 fluid ounces, or roughly 1.89 liters.
This matters for anyone reading metric recipes or comparing US packaging to international sizes. Most milk and juice cartons sold in the US list both — half gallon on the front, 1.89 L in smaller print.
Common Half-Gallon Containers
Milk cartons — the classic half-gallon jug in most US fridges
Water jugs — common for camping or bulk hydration
Mason jars — used for canning, sun tea, or bulk storage
Paint cans — smaller project sizes often come in half-gallon cans
I am the admin and author of Measur Cup, researching, verifying, and simplifying weight, length, and unit conversions to provide accurate, easy-to-understand measurement guides for everyday use.
