Convert fluid ounces to cups

1 fl oz=0.1232cup

Use the converter below to change any fluid ounces value into cups instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.12322

Conversion formula

Forward

cups = fluid ounces × 0.1232

Reverse

fluid ounces = cups × 8.11537

Example: 10 fl oz × 0.1232 = 1.23223 cup.

About both units

From

Fluid Ounce

fl oz

The US fluid ounce equals 29.5735 millilitres — 1/128 of a US gallon. The UK fluid ounce (28.41 ml) is slightly smaller. Used for beverage can sizes in the US, cosmetic product sizes and many US cooking recipes. Do not confuse with the ounce of mass (28.35 g).

Real-world: A US soda can is 12 fl oz (355 ml). A Starbucks Tall is 12 fl oz; Grande is 16; Venti is 20.

Read full fluid ounce reference →

Cup

cup

The US cup equals 240 millilitres in common usage (legally defined as 236.588 ml). The metric cup (Australia, NZ) is 250 ml; the UK "cup" is 284 ml but rarely used in recipes. Cooking recipes from the US dominate online, so 240 ml is the safe default for "cup".

Real-world: 1 cup of water = 240 g = 240 ml. 1 cup of all-purpose flour weighs about 125 g. A Starbucks Tall is 12 fl oz = 1.5 cups.

Read full cup reference →

Fluid Ounce to Cup conversion table

Common fluid ounces to cups values for quick reference.

Fluid Ounce (fl oz)	Cup (cup)
1 fl oz	0.1232 cup
2 fl oz	0.2464 cup
5 fl oz	0.6161 cup
10 fl oz	1.23223 cup
20 fl oz	2.46446 cup
50 fl oz	6.16115 cup
100 fl oz	12.3223 cup
200 fl oz	24.6446 cup
500 fl oz	61.6115 cup
1,000 fl oz	123.223 cup

Tips & common mistakes

Quick tips

1 US fl oz ≈ 29.6 ml; 1 UK fl oz ≈ 28.4 ml.
8 US fl oz ≈ 1 US cup ≈ 237 ml.
Use ml to avoid ambiguity between US and UK fluid ounces.

Avoid these

Mixing US and UK fluid ounces — 16 fl oz (US) = 473 ml vs. 16 fl oz (UK) = 455 ml.
Confusing fluid ounce (volume) with avoirdupois ounce (mass).
Assuming 1 fl oz = 1 oz by weight — only true for pure water and approximately.

Frequently asked questions

How many cups in a fluid ounce?

One fluid ounce equals 0.1232 cups.

How do I convert fluid ounces to cups?

Multiply the fluid ounce value by 0.1232 to get the equivalent in cups.

What is 100 fluid ounces in cups?

100 fluid ounces equals 12.3223 cups.

Is a fluid ounce bigger than a cup?

No. 1 fluid ounce equals 0.1232 cups, so one fluid ounce is smaller.

How to convert fluid ounces to cups without a calculator?

Multiply by 0.12 for a quick estimate; use a calculator for precise results.

Related volume conversions

📊 See full comparison matrix →

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Convert fluid ounces to cups

🧮 Conversion formula