Convert fluid ounces to cubic inches

1 fl oz=1.80469in³

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

You have

Equals

1.804688

Conversion formula

Forward

cubic inches = fluid ounces × 1.80469

Reverse

fluid ounces = cubic inches × 0.5541

Example: 10 fl oz × 1.80469 = 18.0469 in³.

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 →

Cubic Inch

in³

The cubic inch equals 16.387 cubic centimetres. Used in US automotive engineering for engine displacement (e.g., "350 cubic inch V8 = 5.7 L") and in firearms (bullet cartridges). Most of the rest of the world uses cc or litres.

Real-world: 350 cu in V8 = 5.7 L engine. 302 cu in Ford V8 = 4.9 L. Modern specs typically give litres.

Read full cubic inch reference →

Fluid Ounce to Cubic Inch conversion table

Common fluid ounces to cubic inches values for quick reference.

Fluid Ounce (fl oz)	Cubic Inch (in³)
1 fl oz	1.80469 in³
2 fl oz	3.60938 in³
5 fl oz	9.02344 in³
10 fl oz	18.0469 in³
20 fl oz	36.0938 in³
50 fl oz	90.2344 in³
100 fl oz	180.469 in³
200 fl oz	360.938 in³
500 fl oz	902.344 in³
1,000 fl oz	1,804.69 in³

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 cubic inches in a fluid ounce?

One fluid ounce equals 1.80469 cubic inches.

How do I convert fluid ounces to cubic inches?

Multiply the fluid ounce value by 1.80469 to get the equivalent in cubic inches.

What is 100 fluid ounces in cubic inches?

100 fluid ounces equals 180.469 cubic inches.

Is a fluid ounce bigger than a cubic inch?

Yes. 1 fluid ounce equals 1.80469 cubic inches, so one fluid ounce is larger.

How to convert fluid ounces to cubic inches without a calculator?

Multiply by 1.8 for a quick estimate; use a calculator for precise results.

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