How do you convert cubic inches to fluid ounces?

To convert cubic inches (in³) to fluid ounces (fl oz), multiply the volume in cubic inches by 0.55411 (fluid ounces = cubic inches × 0.55411).

What is 5 cubic inches in fluid ounces?

5 cubic inches (5 in³) is equal to 2.77056 fluid ounces (2.77056 fl oz).

Which is larger, 1 cubic inch (in³) or 1 fluid ounce (us) (fl oz)?

One fluid ounce (us) (fl oz) is larger than one cubic inch (in³). Specifically, 1 fl oz equals 1.80469 in³, while 1 in³ is 0.55411 fl oz.

How do I convert back from fluid ounces (us) (fl oz) to cubic inches (in³)?

To reverse the calculation from fl oz to in³, multiply your fluid ounce (us) value by the inverse factor 1.80469 (or divide by 0.55411). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round in³ to fl oz results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 in³ ≈ 2.77 fl oz). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Cubic Inches to Fluid Ounces Converter

Enter the volume in cubic inches below to convert it to fluid ounces.

Fluid Ounces (US) to Cubic Inches (fl oz → in³)

Convert Cubic Inches to Fluid Ounces (US)

Enter a value in cubic inches (in³) to convert to fluid ounces (us) (fl oz).

Value (in³)

From

Result

•

2.770562771fluid ounces (us)

5 in³ = 2.770562771 fl oz

Result updates automatically

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Equivalent Measurements Across UnitsFor 5 in³

Milliliters81.93532 mL

Liters0.08194 L

Suggested Conversions

Reference:NIST OWM (SI Units — Volume)

[1–3] ↓

Cubic Inch to Fluid Ounce Conversion Table

Table showing various cubic inch measurements converted to fluid ounces. Click any preset value or arrow to load it into the converter.

Cubic Inches (in³)	Fluid Ounces (US) (fl oz)
1 in³	0.5541126 fl oz
2 in³	1.1082251 fl oz
2.5 in³	1.3852814 fl oz
5 in³	2.7705628 fl oz
10 in³	5.5411255 fl oz
15 in³	8.3116883 fl oz
20 in³	11.0822511 fl oz
25 in³	13.8528139 fl oz
30 in³	16.6233766 fl oz
50 in³	27.7056277 fl oz

How to Convert Cubic Inches to Fluid Ounces

To convert cubic inches to fluid ounces, multiply the volume by the following conversion ratio: 0.5541126 fluid ounces/cubic inch.

Since one cubic inch is equal to 0.5541126 fluid ounces, you can use this simple formula to convert:

fluid ounces = cubic inches × 0.5541126

The volume in fluid ounces is equal to the volume in cubic inches multiplied by 0.5541126.

For example, here's how to convert 5 cubic inches to fluid ounces using the formula above.

fluid ounces = (5 in³ × 0.5541126) = 2.7705628 fl oz

How Many Fluid Ounces Are in a Cubic Inch?

There are 0.5541126 fluid ounces in a cubic inch, which is why we use this value in the formula above.

1 in³ = 0.5541126 fl oz|1 fl oz = 1.8046875 in³

Our cubic inch to fluid ounce calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Cubic Inches and fluid ounces are both units used to measure volume. Keep reading to learn more about each unit.

What Is a Cubic Inch?

A cubic inch is a unit of volume equal to 0.0163871 liters (L), the base unit for volume. Equal to 16.387064 milliliters. [1]

The cubic inch is classified as a US customary and imperial unit of volume. Cubic Inches can be abbreviated as in³; for example, 1 cubic inch can be written as 1 in³.

When working with cubic inches (in³) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, cubic inches (in³) are widely used across standard volume applications within US customary and imperial workflows, engineering documentation, and technical data sheets.

Learn more about cubic inches in our Volume & Liquid Converter.

What Is a Fluid Ounce?

A fluid ounce is a unit of volume equal to 0.0295735 liters (L), the base unit for volume. 1/128 of a US gallon (29.5735 mL). [2]

The fluid ounce is classified as a US customary unit of volume. Fluid Ounces can be abbreviated as fl oz; for example, 1 fluid ounce can be written as 1 fl oz.

When working with fluid ounces (fl oz) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, fluid ounces (fl oz) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.

Learn more about fluid ounces in our Volume & Liquid Converter.

When converting volume between cubic inches (in³) and fluid ounces (fl oz), keep full floating-point precision (1 in³ = 0.5541126 fl oz; 1 fl oz = 1.8046875 in³) during intermediate calculations and round only the final fluid ounce figure to match your instrument tolerance.

More Cubic Inch & Fluid Ounce Conversions

Need to calculate in the opposite direction? Use our fluid ounces (us) to cubic inches calculator to switch your starting unit immediately. You can also explore related tools such as converting fluid ounces (us) to cubic inches, converting milliliters to fluid ounces (us), or converting cups (us) to fluid ounces (us).

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Convert to Fluid Ounces

Converting Grams or Ounces to Cups, Tbsp & Tsp?

Open Cooking & Ingredient Converter

Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:

Flour (125 g/cup)Granulated Sugar (200 g/cup)Brown Sugar (220 g/cup)Powdered Sugar (120 g/cup)Butter (227 g/cup)Rice (185 g/cup)Milk (244 g/cup)Water (236.6 g/cup)Honey (339 g/cup)Cooking Oil (218 g/cup)Salt (292 g/cup)

Frequently Asked Questions

There are 0.55411 fluid ounces (fl oz) in 1 cubic inch (in³). Conversely, 1 fluid ounce (fl oz) is equal to 1.80469 cubic inches (in³).

Volume & Liquid Converter

Quick Info

Direct Factor: 1 cubic inch (in³) equals 0.55411 fluid ounces (us) (fl oz).
Inverse Factor: 1 fluid ounce (us) (fl oz) equals 1.80469 cubic inches (in³).
Formula: fluid ounces (us) = cubic inches × 0.55411.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Cubic Inch (in³)

Equal to 16.387064 milliliters.

Fluid Ounce (US) (fl oz)

1/128 of a US gallon (29.5735 mL).

Liter (L)

Metric unit of volume equal to 1 cubic decimeter (1,000 mL).

References

[1]NIST OWM · SI Units — Volume
Source
[2]NIST HB 44 · Liquid & Dry Capacity Tables
Source
[3]NIST SP 811 · NIST SP 811 App. B.9
Source

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References

NIST · BIPM · ISO

[1]
NIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Cubic Inches (in³) to Fluid Ounces (US) (fl oz)
NIST OWM Standard
[2]
NIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Cubic Inch (in³) & Fluid Ounce (US) (fl oz)
NIST HB 44 Specification
[3]
NIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (in³ to fl oz)
NIST SP 811 Reference

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