There are exactly 8 fluid ounces in 1 cup of water, which equals 236.6 milliliters. Use the chart and calculator below for any amount.
| Cups | Fluid Ounces | Milliliters | Liters |
|---|---|---|---|
| ¼ cup | 2 fl oz | 59.1 ml | 0.059 L |
| ½ cup | 4 fl oz | 118.3 ml | 0.118 L |
| ¾ cup | 6 fl oz | 177.4 ml | 0.177 L |
| 1 cup | 8 fl oz | 236.6 ml | 0.237 L |
| 2 cups | 16 fl oz | 473.2 ml | 0.473 L |
| 4 cups | 32 fl oz | 946.4 ml | 0.946 L |
| 8 cups | 64 fl oz | 1,892 ml | 1.893 L |
| 16 cups | 128 fl oz | 3,785 ml | 3.785 L (1 gal) |
| Daily Goal | Cups | Fluid Ounces | Liters |
|---|---|---|---|
| Minimum recommended | 6 cups | 48 fl oz | 1.4 L |
| 8 glasses rule | 8 cups | 64 fl oz | 1.9 L |
| Women (recommended) | 9 cups | 72 fl oz | 2.1 L |
| Men (recommended) | 13 cups | 104 fl oz | 3.1 L |
| Active adults | 13-16 cups | 104-128 fl oz | 3-3.8 L |
How many ounces in a cup of water?
There are exactly 8 fluid ounces in 1 cup of water, which equals 236.6 milliliters.
How many ounces in 2 cups of water?
There are 16 fluid ounces in 2 cups of water.
How many cups of water is 8 oz?
8 fluid ounces is exactly 1 cup of water.
How many cups of water should I drink a day?
The general recommendation is 8 cups (64 oz) per day, though women need about 9 cups and men about 13 cups according to health guidelines.
Is a cup of water the same as a cup of any liquid?
For volume, yes — 1 cup always equals 8 fluid ounces regardless of the liquid. However, the weight in grams will vary since different liquids have different densities.