64 oz (US fluid ounces) is exactly half a gallon. That equals 8 cups, 4 pints or 2 quarts, and about 1.89 liters (1,892.7 mL). If you mean weight ounces instead, 64 oz is 4 pounds, or about 1.81 kg. So the answer depends on whether your label measures liquid volume or weight.
Convert 64 oz to Cups, Quarts and Liters
The converter below starts at 64 US fluid ounces. Then change the number or the unit, and it updates right away. It uses the exact US definitions, so the metric results match NIST tables. It also lists UK fluid ounces and pints for recipes from Britain.
You usually meet 64 oz on a label. For example, it appears on half-gallon cartons of milk and juice, big water jugs, and beer growlers. Recipes for soup, brine, punch or iced tea also use it often. Because “oz” can mean two different things, though, the number alone can mislead you.
On drinks and other liquids, oz almost always means the fluid ounce, a unit of volume. On solid food, by contrast, it means the avoirdupois ounce, a unit of weight. The US National Institute of Standards and Technology (NIST) defines both in its Handbook 44 tables of units. According to those tables, one US fluid ounce is about 29.573 mL, and one weight ounce is about 28.35 grams.
First, this page gives you a chart for nearby amounts too. Next, it explains fluid versus weight ounces, how to measure it at home, and what the number means for daily water intake.
64 oz Conversion Chart (US Fluid Ounces)
All values below use the exact US definitions: 1 cup = 8 fl oz, 1 quart = 32 fl oz, and 1 gallon = 128 fl oz. In addition, the metric values are rounded to one decimal place.
| Fluid ounces | Cups | Pints / quarts | Milliliters | Liters |
|---|---|---|---|---|
| 8 fl oz | 1 | 1/2 pint | 236.6 mL | 0.237 L |
| 12 fl oz | 1 1/2 | 3/4 pint | 354.9 mL | 0.355 L |
| 16 fl oz | 2 | 1 pint | 473.2 mL | 0.473 L |
| 20 fl oz | 2 1/2 | 1 1/4 pints | 591.5 mL | 0.591 L |
| 24 fl oz | 3 | 1 1/2 pints | 709.8 mL | 0.710 L |
| 32 fl oz | 4 | 1 quart | 946.4 mL | 0.946 L |
| 48 fl oz | 6 | 1 1/2 quarts | 1,419.5 mL | 1.420 L |
| 64 fl oz | 8 | 2 quarts (1/2 gallon) | 1,892.7 mL | 1.893 L |
| 96 fl oz | 12 | 3 quarts | 2,839.1 mL | 2.839 L |
| 128 fl oz | 16 | 4 quarts (1 gallon) | 3,785.4 mL | 3.785 L |
Want a copy for the fridge door? Then print this page, or simply save a screenshot of the chart. Also, 64 fl oz equals 128 tablespoons or 384 teaspoons, which helps when you scale a recipe up from small amounts.
Recommended Tools for Measuring Liquids by the Cup
A large glass measuring cup is the simplest way to measure 64 oz of liquid. For example, a 4-cup jug fills twice to reach it, and the clear sides let you read the line at eye level. A kitchen scale is the better partner for weight ounces, because it reads ounces, pounds and grams directly. Also, choose models with printed metric and US markings, and look for a tare button on scales.
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Is 64 oz a Volume or a Weight?
Both, depending on the label, because one abbreviation covers two units. That is why the same “64 oz” can describe a jug of juice and a bag of rice. Therefore, the table below separates the three ounces people confuse most often.
| Unit | What it measures | Size of 1 unit | Value of 64 units |
|---|---|---|---|
| US fluid ounce (fl oz) | Volume | 29.574 mL | 1,892.7 mL (1/2 US gallon) |
| UK (imperial) fluid ounce | Volume | 28.413 mL | 1,818.4 mL (3.2 UK pints) |
| Avoirdupois ounce (oz) | Weight (mass) | 28.350 g | 1,814.4 g (exactly 4 lb) |
For water, the two are close, so a mix-up does little harm. For instance, 64 fl oz of water weighs about 1,890 g, or roughly 4.2 lb. Honey, flour or oil, however, weigh very different amounts per cup, so the ounce types are not interchangeable for them. To learn more about the weight unit, read our guide to how much an ounce weighs.
What 64 oz Looks Like in Everyday Life
In fact, seeing the volume helps more than any chart. Here are common containers that hold about 64 fluid ounces:
- Half-gallon carton. For example, milk, juice and broth come in this size.
- Beer growler. Similarly, the standard US growler holds 64 fl oz, about four pint glasses.
- Large water jug. Also, many reusable “half-gallon” bottles are sold for tracking daily water.
- Two quart jars. Two 32 oz mason jars together hold exactly 64 oz.
- Almost a 2-liter bottle. A 2-liter soda bottle holds about 67.6 fl oz, so it is slightly bigger.
Similarly, standard 16.9 fl oz (500 mL) water bottles are a handy reference. Roughly 3.8 of them make half a gallon. If you think in liters instead, our page on how much 3 liters of water is shows the larger metric bottles in cups and ounces.
How to Measure 64 oz of Liquid at Home
You do not need a half-gallon jug for this job. Instead, follow these steps with a regular measuring cup:
- Choose a clear container with markings. A 4-cup (32 fl oz) glass measuring cup is the easiest choice, because you only need to fill it twice.
- Set it on a flat counter. Otherwise, a tilted cup reads high on one side and low on the other, so level ground matters.
- Pour to the 4-cup or 32 oz line. Next, bend down until your eye is level with the line and read the bottom of the curved surface.
- Empty it and repeat once. Two full 32 fl oz pours give you exactly 64 fl oz, or 8 cups.
- Check the total on a scale if you need precision. With water, you can also tare a pitcher and pour until the scale shows about 1,890 g.
If you only own a 1-cup measure, fill it 8 times and count out loud. Likewise, a 2-cup measure needs 4 fills. For the cup in milliliters, see how many mL are in 1 cup.
Is 64 oz of Water a Day Enough?
The popular “8 glasses of 8 ounces” rule adds up to exactly 64 oz, or half a gallon. Because of that, it is easy to remember. Still, it is a rule of thumb, not a medical standard. According to Mayo Clinic, most healthy adults get enough with about 11.5 to 15.5 cups (2.7 to 3.7 liters) of total fluid a day. Moreover, that total counts fluid from all drinks and food, and food supplies about 20 percent of it.
So 64 oz of plain water can be a reasonable target for many people, because other drinks and meals fill the gap. On the other hand, heat, exercise, pregnancy and some health conditions change the amount you need. As a result, the best number for you is a personal one.
Do and Don’t When Measuring Half a Gallon
Do
- Check whether the label says fl oz or net weight.
- Read liquid lines at eye level, because angles distort them.
- Use a 4-cup measuring cup to save time.
- Also weigh water on a scale for extra precision.
- Note whether a recipe is US or British.
Don’t
- Assume weight ounces of flour fill 8 cups.
- Pour liquids into dry nesting cups, because they spill.
- Treat a 2-liter bottle as exactly 64 oz.
- Forget to count each refill, especially across 8 pours.
- Rely on a drinking glass as a cup measure.
Honest Limits of These 64 oz Numbers
The conversions on this page are exact by definition, yet real measuring has some slack. First, printed lines on plastic jugs and bottles are often approximate. Second, a reading taken from above instead of at eye level can be off by a few milliliters per pour. Third, liquids expand slightly when warm, so a hot liquid takes a bit more space than the same amount cold. In practice, these errors are small for soups, drinks and brines. For baking or lab work, however, weigh the liquid in grams on a scale. Also remember that volume-to-weight changes with the ingredient. For example, one cup of water weighs about 236 g, while one cup of flour weighs only about half that.
Frequently Asked Questions About 64 oz
Is 64 oz half a gallon?
Yes. A US gallon holds 128 fluid ounces, so 64 fl oz is exactly half a gallon, or 2 quarts.
How many cups are in half a gallon?
There are 8 US cups in half a gallon, or 64 fluid ounces, because each cup holds 8 fl oz.
How many liters is 64 oz?
64 US fluid ounces is about 1.89 liters (1.8927 L). In other words, it is a little less than a 2-liter soda bottle.
What is 64 fluid ounces in milliliters?
64 US fluid ounces equals about 1,892.7 mL, because one fluid ounce is 29.5735 mL.
How many quarts and pints make half a gallon?
Half a gallon is 2 US quarts or 4 US pints, because a quart is 32 fl oz and a pint is 16 fl oz.
How many pounds is 64 oz by weight?
If you mean weight ounces, 64 oz is exactly 4 pounds, or about 1.81 kg.
Is 64 oz of water a day enough?
It depends on the person. The familiar eight-glass rule equals 64 oz, but Mayo Clinic gives a range of about 11.5 to 15.5 cups of total fluid a day for healthy adults, including fluid from food. So ask a doctor about your own needs.
How many 16.9 oz water bottles make half a gallon?
About 3.8 bottles. Four standard 16.9 fl oz bottles hold 67.6 fl oz, slightly more than half a gallon.
Is a UK fluid ounce the same size as a US one?
Not quite. A UK fluid ounce is about 28.41 mL, so 64 UK fluid ounces is about 1,818 mL, roughly 74 mL less than 64 US fluid ounces.
What containers hold half a gallon?
Think of a half-gallon milk or juice carton, a beer growler, or a large reusable water jug. All of them hold about 64 fl oz.
The Bottom Line on 64 oz
To sum up, 64 US fluid ounces is half a gallon: 8 cups, 4 pints, 2 quarts, or about 1.89 liters. If the label shows a net weight, then 64 oz is 4 pounds, or about 1.81 kg instead.
Finally, keep the converter above for other amounts. Also, check the label wording before you measure, and read liquid lines at eye level. In short, those two habits solve most ounce mix-ups. For more volume conversions, see our guide to US vs UK cooking measurements.
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