Cups to Fluid ounces Converter cup → fl oz

1 cup (us) (cup) = 8 fluid ounces (fl oz). Type a value below — the conversion happens instantly, entirely on your device.

From

1 cup = 8 fl oz

Precision

1 cups = 8 fluid ounces

1 × 8 = 8

1 cup equals 8 fl oz, so multiplying by 8 converts the value. The result describes the exact same quantity — only the measuring stick changes.

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How to convert cups to fluid ounces

fluid ounces = cups × 8 — multiply the cup (us) value by 8.

Example: 10 cup = 80 fl oz.

To convert the other way: cups = fluid ounces ÷ 8 — or use the dedicated fl oz to cup converter .

Cups to Fluid ounces conversion table

Cups (cup)	Fluid ounces (fl oz)
0.1	0.8
0.25	2
0.5	4
1	8
2	16
3	24
4	32
5	40
6	48
7	56
8	64
9	72
10	80
15	120
20	160
25	200
30	240
40	320
50	400
75	600
100	800
250	2000
500	4000
1000	8000

About the units

What is a cup (us)?

A US cup is exactly 236.588 mL — 8 US fluid ounces or 16 tablespoons. It is the foundational measure of American recipes. (A metric cup, used in Australia, is 250 mL.)

What is a fluid ounce (us)?

A US fluid ounce (fl oz) is exactly 29.5735 mL — 1/8 of a US cup. Drink sizes and cosmetics are commonly labeled in fluid ounces. (The UK fluid ounce is slightly smaller: 28.41 mL.)

Frequently asked questions

How many fluid ounces are in 1 cup (us)?

1 cup (us) (cup) = 8 fluid ounces (fl oz).

What is the formula to convert cups to fluid ounces?

fluid ounces = cups × 8 — multiply the cup (us) value by 8.

How do I convert cup to fl oz without a calculator?

Multiply by 8 for a close estimate. Exact factor: 1 cup = 8 fl oz.

Is this cup-to-fl oz converter accurate and private?

Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.