When you're shopping for a gallon of milk or need to figure out how many cups are in a half-gallon, it's helpful to know how much is half a gallon in liters. This unit of measurement isn't the same as a pint, quart or cup — and it can be confusing to those unfamiliar with the term.
A gallon is a standard measure of volume in the United States. There are 128 fluid ounces in a gallon and there are 64 fluid ounces in a half-gallon. In addition to liquid measurements, a gallon can also be measured in dry pounds or kilograms. The dry gallons are less common in the United States, but you may still come across them in recipes and at home improvement stores.
Getting enough water is essential to healthy living. Staying properly hydrated allows the body to perform all of its important functions, from temperature regulation to joint lubrication to waste removal. It's important to note that too much water can cause dangerous hyponatremia, a condition in which the sodium level in the blood becomes dangerously low.
Knowing how much is a half-gallon makes it easier to monitor your daily hydration. You'll want to be sure you're drinking enough fluids, especially if you're active or on a weight loss plan. A good goal is to drink eight glasses of water a day. If you're not sure how to track your water intake, try using one of the many smartphone apps available for tracking your health.