Convert cubic inches to fluid ounces

1 in³=0.5541fl oz

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

You have

Equals

0.55411

Conversion formula

Forward

fluid ounces = cubic inches × 0.5541

Reverse

cubic inches = fluid ounces × 1.80469

Example: 10 in³ × 0.5541 = 5.54113 fl oz.

About both units

From

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

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 to Fluid Ounce conversion table

Common cubic inches to fluid ounces values for quick reference.

Cubic Inch (in³)	Fluid Ounce (fl oz)
1 in³	0.5541 fl oz
2 in³	1.10823 fl oz
5 in³	2.77056 fl oz
10 in³	5.54113 fl oz
20 in³	11.0823 fl oz
50 in³	27.7056 fl oz
100 in³	55.4113 fl oz
200 in³	110.823 fl oz
500 in³	277.056 fl oz
1,000 in³	554.113 fl oz

Tips & common mistakes

Quick tips

1 in³ = 16.387 cm³ exactly.
To convert cubic inches to litres, divide by 61.02.
US automotive ads today quote both cu in and L for classic cars.

Avoid these

Confusing in³ with in² or linear inches.
Using 16 instead of 16.387 on precision machining.
Assuming modern European engines are marked in cu in — they are always in L or cc.

Frequently asked questions

How many fluid ounces in a cubic inch?

One cubic inch equals 0.5541 fluid ounces.

How do I convert cubic inches to fluid ounces?

Multiply the cubic inch value by 0.5541 to get the equivalent in fluid ounces.

What is 100 cubic inches in fluid ounces?

100 cubic inches equals 55.4113 fluid ounces.

Is a cubic inch bigger than a fluid ounce?

No. 1 cubic inch equals 0.5541 fluid ounces, so one cubic inch is smaller.

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

Multiply by 0.55 for a quick estimate; use a calculator for precise results.

Related volume conversions

📊 See full comparison matrix →

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