How Many Fluid Ounces in a Cup

Quick answer: 8 fluid ounces — essential for recipes

⚡Quick Answer

1 US cup = 8 fluid ounces = 237 ml. This is the standard for American recipes.

cups

8fl oz

8 fluid ounces in a US cup. This is the standard measurement for cooking and baking in the US.

💡8 fl oz = 1 cup is one of the most important cooking conversions!

1/4 cup = 2 fl oz | 1/3 cup ≈ 2.7 fl oz | 1/2 cup = 4 fl oz | 3/4 cup = 6 fl oz | 1 cup = 8 fl oz

💡Half cup = 4 fl oz is very common in recipes.

1 cup = 8 fl oz | 1 pint = 16 fl oz (2 cups) | 1 quart = 32 fl oz (4 cups) | 1 gallon = 128 fl oz (16 cups)

💡Remember: 2 cups = 1 pint, 4 cups = 1 quart.

US cup = 8 fl oz = 237 ml | UK cup = 10 fl oz = 284 ml. Always check which system your recipe uses!

💡UK recipes use Imperial cups (10 fl oz), which are 25% larger.

A US cup is 8 fluid ounces. UK/Imperial cups are 10 fl oz. Metric cups are 250 ml (about 8.5 fl oz). Check your recipe's origin!

Ounces (oz) measure weight; fluid ounces (fl oz) measure volume. 8 fl oz of water weighs about 8 oz, but this varies with density.

A standard 16.9 fl oz water bottle = about 2.1 cups (just over 2 cups).

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