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Convert cups to fluid ounces

1 cup equals 8 fluid ounces. Type any number below — the other side updates instantly.

Cups to fluid ounces — quick reference

cupsfluid ounces
0.25 cup2 fl oz
0.5 cup4 fl oz
1 cup8 fl oz
1.5 cup12 fl oz
2 cup16 fl oz
3 cup24 fl oz
4 cup32 fl oz
5 cup40 fl oz
8 cup64 fl oz
10 cup80 fl oz

How to convert

Multiply the number of cups by 8 to get fluid ounces. To go the other way, multiply fluid ounces by 0.125 to get cups. The conversion factor is fixed and exact, so you can use this on any value.

About these units

Cups

Definition
A US cup is 8 US fluid ounces, or about 236.6 ml. The metric cup is 250 ml exactly.
History
Standardized cooking measures became common in the US in the early 20th century, popularized by Fannie Farmer's Boston Cooking-School Cook Book (1896).
Current use
The cup is the everyday cooking measure in the US, Canada, Australia, and many English-language recipes worldwide.

Fluid ounces

Definition
A US fluid ounce (symbol: fl oz) equals about 29.57 ml. There are 16 fl oz in a US pint and 128 in a US gallon.
History
The US fluid ounce was set by Congress in 1832. The Imperial fluid ounce (used in the UK) is slightly different at about 28.41 ml.
Current use
Used in the US for liquid measurements — beverages, recipes, cosmetics — and shown on most US food and drink labels.

Frequently asked

How many fluid ounces are in 1 cup?
1 cup = 8 fluid ounces.
How do you convert cups to fluid ounces?
Multiply the number of cups by 8 to get fluid ounces. To go the other way, multiply fluid ounces by 0.125 to get cups. The conversion factor is fixed and exact, so you can use this on any value.
What is 3 cups in fluid ounces?
3 cups = 24 fluid ounces.
Reverse conversionFluid ounces to cups

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