How Many Ounces in a Cup?
There are exactly 8 fluid ounces in a US cup. Use the chart and calculator below for any amount.
Ounces & Cups Converter
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Full Ounces to Cups Conversion Chart
This table covers the most commonly searched ounce and cup conversions all in one place.
| Cups | Fluid Ounces | Tablespoons | Milliliters |
|---|---|---|---|
| ⅛ cup | 1 fl oz | 2 tbsp | 30 ml |
| ¼ cup | 2 fl oz | 4 tbsp | 59 ml |
| ⅓ cup | 2.7 fl oz | 5 tbsp | 79 ml |
| ½ cup | 4 fl oz | 8 tbsp | 118 ml |
| ⅔ cup | 5.3 fl oz | 11 tbsp | 158 ml |
| ¾ cup | 6 fl oz | 12 tbsp | 177 ml |
| 1 cup | 8 fl oz | 16 tbsp | 237 ml |
| 2 cups | 16 fl oz | 32 tbsp | 473 ml |
| 4 cups | 32 fl oz | 64 tbsp | 946 ml |
| 8 cups | 64 fl oz | 128 tbsp | 1,893 ml |
| 16 cups | 128 fl oz | 256 tbsp | 3,785 ml |
Fluid Ounces vs Weight Ounces
This is one of the most common points of confusion in the kitchen. Fluid ounces (fl oz) measure volume — how much space a liquid takes up. Weight ounces (oz) measure how heavy something is.
When a recipe says "8 ounces of water" it almost always means fluid ounces. But "8 ounces of flour" means weight. A kitchen scale handles weight ounces while a measuring cup handles fluid ounces.
Does it matter for cooking?
For water and most thin liquids, 8 fluid ounces weighs almost exactly 8 weight ounces — so it usually doesn't matter. But for dense ingredients like honey, oil, or flour the difference is significant, so always check what your recipe intends.
Frequently Asked Questions
How many ounces in a cup of water?
8 fluid ounces. Water is one of the few ingredients where fluid ounces and weight ounces are essentially the same, so 1 cup = 8 fl oz = approximately 8 oz by weight.
How many ounces in a cup of coffee?
A standard US measuring cup holds 8 fluid ounces. However a typical coffee mug holds 10–12 oz, and a "cup" on your coffee maker may be set to 5 or 6 oz. Always check your machine.
How many cups is 32 oz?
32 oz is 4 cups. Divide 32 by 8 (ounces per cup) to get 4.
How many cups is 16 oz?
16 oz is exactly 2 cups. This is a very common conversion — a standard water bottle or pint container is 16 oz.
How many ounces in a cup of milk?
8 fluid ounces. Milk measures the same as water by volume — 1 cup = 8 fl oz regardless of what liquid you're measuring.
How many ounces in a dry cup?
A dry measuring cup holds the same volume as a liquid one — 8 fluid ounces. But dry ingredients are measured by weight, so 1 cup of flour weighs about 4.5 oz while 1 cup of sugar weighs about 7 oz.