Convert Cubic Inch to US Fluid Ounce
Convert cubic inches to us fluid ounces instantly. 1 cubic inch = 0.5541125541 us fluid ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Fluid Ounce to Cubic Inch converter for the reverse conversion.
Units explained
Cubic Inch
A cubic inch is the volume of a cube one inch on a side (16.387 mL).
Derived by cubing the international inch (25.4 mm).
Used for engine displacement and small-part volumes.
1959 yard agreement.
US Fluid Ounce
A US fluid ounce is 1/128 of a US gallon (29.5735 mL).
Derived from the gallon subdivision; distinct from the slightly smaller UK fluid ounce.
Standard for US beverage and nutrition labeling.
English customary; US since 1824.
Cubic Inch to US Fluid Ounce conversion formula
The relationship between cubic inches and us fluid ounces:
To convert cubic inches to us fluid ounces, multiply the value in cubic inches by 0.5541125541. To reverse, multiply us fluid ounces by 1.8046875.
How to use this converter
Type a value into the calculator. The result in us fluid ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Fluid Ounce to Cubic Inch converter for the reverse direction.
Step-by-step: convert cubic inches to us fluid ounces
- Write down the value in cubic inches (in³).
- Multiply that value by the factor 0.5541125541.
- The product is the equivalent value in us fluid ounces (fl oz).
- To reverse, multiply the us fluid ounce value by 1.8046875.
Worked examples
Example 1 — Convert 1 in³ to fl oz:
1 × 0.5541125541 = 0.5541125541 fl oz
Example 2 — Convert 100 in³ to fl oz:
100 × 0.5541125541 = 55.4112554113 fl oz
Real-world example — Plastic-film thickness alternates
A 150-cubic inch plastic film converts cleanly to us fluid ounces — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 in³ × 0.5541125541 = 83.1168831169 fl oz
Real-world example — Hair-width scale measurements
A 70-cubic inch measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like us fluid ounces for direct comparison across supplier datasheets.
70 in³ × 0.5541125541 = 38.7878787879 fl oz
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 cubic inches), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 in³ × 0.5541125541 = 1.6623376623 fl oz
Cubic Inch to US Fluid Ounce conversion table
Standard reference values for converting cubic inches to us fluid ounces:
| Cubic Inch [in³] | US Fluid Ounce [fl oz] |
|---|---|
| 0.01 | 0.0055411255 |
| 0.1 | 0.0554112554 |
| 1 | 0.5541125541 |
| 2 | 1.1082251082 |
| 3 | 1.6623376623 |
| 4 | 2.2164502165 |
| 5 | 2.7705627706 |
| 10 | 5.5411255411 |
| 20 | 11.0822510823 |
| 30 | 16.6233766234 |
| 40 | 22.1645021645 |
| 50 | 27.7056277056 |
| 100 | 55.4112554113 |
| 500 | 277.0562770563 |
| 1000 | 554.1125541126 |
Frequently asked questions
How many us fluid ounces is 1 cubic inch?
How do I convert cubic inches to us fluid ounces?
How do I convert us fluid ounces back to cubic inches?
How many us fluid ounces is 100 cubic inches?
Popular volume unit conversions
Convert Cubic Inch to other volume units
Show all Cubic Inch conversions
Metric / SI (8 units)
US Customary (Liquid) (8 units)
Imperial (UK) (4 units)
Cubic (length-derived) (2 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 in³ = 0.5541125541 fl oz) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.