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Cooking conversion
Cups of Water to Ounces
How many ounces are in cups of water? Type a value below to see the result instantly. Cooking conversions depend on the density of each ingredient — the math here uses 1.000 g/mL for water.
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1 cup of water = 8.3454 oz
Cups of Water to Ounces Conversion Table
Common values for water:
| Cups of water | Ounces |
|---|---|
| 0.25 cup | 2.0863 oz |
| 0.5 cup | 4.1727 oz |
| 1 cup | 8.3454 oz |
| 2 cup | 16.6908 oz |
| 3 cup | 25.0362 oz |
| 4 cup | 33.3816 oz |
| 5 cup | 41.727 oz |
| 8 cup | 66.7632 oz |
| 10 cup | 83.454 oz |
How this works
Water has a density of about 1.000 g/mL (si definition). That means 1 mL of water weighs 1.000 grams.
Ounces = cups × 8.3454
Note: By definition at 4°C. Within 0.5% across cooking temperatures.
Why a cup of water doesn't always weigh the same
Volume measurements are forgiving in some ways and brutal in others. A cup of water can vary by 10-20% in weight depending on how it's measured: spooned vs scooped, packed vs loose, sifted vs unsifted. The density figure used here matches the most common published recipe conventions, but if you're after baking precision, weighing on a kitchen scale is more accurate than measuring by volume.