Convert Cubic inches to US fluid ounces
1 cubic inch is 0.55 fl oz. One cubic inch is exactly 0.554112554113 US fluid ounces.
One cubic inch is 0.55411255 US fluid ounces. To convert cubic inches to US fluid ounces, multiply by 0.55411255; to go the other way, divide by 0.55411255 or multiply by 1.8046875. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Handbook 130. Exactly 16.387064 millilitres, since the inch is exactly 25.4 mm.
Factor checked against the defining standard · How we check
- Cubic inches × 0.55411255
1 * 0.55411260.554 fl oz
1 cubic inch in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 3.324675325 tsp | × 3.32467532468 |
| US tablespoons | 1.108225108 tbsp | × 1.10822510823 |
| US fluid ounces | 0.5541125541 fl oz | × 0.554112554113 |
| US cups | 0.06926406926 cup | × 0.0692640692641 |
| US pints | 0.03463203463 pt | × 0.034632034632 |
| US quarts | 0.01731601732 qt | × 0.017316017316 |
| US gallons | 0.004329004329 gal | × 0.004329004329 |
| milliliters | 16.387064 ml | × 16.387064 |
| liters | 0.016387064 L | × 0.016387064 |
| imperial gallons | 0.00360465015 gal (UK) | × 0.00360465014991 |
| imperial quarts | 0.0144186006 qt (UK) | × 0.0144186005996 |
| imperial pints | 0.0288372012 pt (UK) | × 0.0288372011993 |
| imperial fluid ounces | 0.576744024 fl oz (UK) | × 0.576744023985 |
| imperial gills | 0.1153488048 gi (UK) | × 0.115348804797 |
| cubic millimetres | 16,387.064 mm³ | × 16,387.064 |
| cubic centimetres | 16.387064 cm³ | × 16.387064 |
| cubic inches (as entered) | 1 in³ | — |
| cubic feet | 0.0005787037037 ft³ | × 0.000578703703704 |
| cubic yards | 0.00002143347051 yd³ | × 0.0000214334705075 |
| cubic metres | 0.000016387064 m³ | × 0.000016387064 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert cubic inches to US fluid ounces? The converter and the working
- 1.Take the measurement in cubic inches.
- 2.Multiply by 0.55411255 — that is how many US fluid ounces fit in one cubic inch.
- 3.To go back the other way, divide by 0.55411255, or multiply by 1.8046875.
Worked example: 25 cubic inches to US fluid ounces
- Formula
- in³ × 0.55411255 = fl oz
- Arithmetic
- 25 × 0.55411255 = 13.85 fl oz
- Answer
- 25 in³ = 13.85 fl oz
The factor is rounded for display; the figure above is computed from the full value.
Cubic inches to US fluid ounces conversion table
| Cubic inches | US fluid ounces |
|---|---|
| 1 in³ | 0.55 fl oz |
| 2 in³ | 1.11 fl oz |
| 3 in³ | 1.66 fl oz |
| 4 in³ | 2.22 fl oz |
| 5 in³ | 2.77 fl oz |
| 6 in³ | 3.32 fl oz |
| 7 in³ | 3.88 fl oz |
| 8 in³ | 4.43 fl oz |
| 9 in³ | 4.99 fl oz |
| 10 in³ | 5.54 fl oz |
| 12 in³ | 6.65 fl oz |
| 15 in³ | 8.31 fl oz |
| 20 in³ | 11.08 fl oz |
| 25 in³ | 13.85 fl oz |
| 50 in³ | 27.71 fl oz |
| 100 in³ | 55.41 fl oz |
| 200 in³ | 110.82 fl oz |
| 300 in³ | 166.23 fl oz |
| 500 in³ | 277.06 fl oz |
| 1000 in³ | 554.11 fl oz |
| 2000 in³ | 1,108.23 fl oz |
| 5000 in³ | 2,770.56 fl oz |
| 10000 in³ | 5,541.13 fl oz |
What is a cubic inch?
Exactly 16.387064 millilitres, since the inch is exactly 25.4 mm. American engine displacement was quoted in it until the 1980s — a 350 small block is 5.7 litres.
What is a US fluid ounce?
Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
How many US fluid ounces are in a cubic inch?
One cubic inch is 0.55411255 US fluid ounces. Going the other way, one US fluid ounce is 1.8046875 cubic inches. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a cubic inch.
Cite this page
- APA
- Rule Calculator. (2026). Convert Cubic inches to US fluid ounces. Rule Calculator. https://rulecalculators.com/convert/cubic-inch-to-fluid-ounce
- MLA
- "Convert Cubic inches to US fluid ounces." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/cubic-inch-to-fluid-ounce.
- Chicago
- Rule Calculator. "Convert Cubic inches to US fluid ounces." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/cubic-inch-to-fluid-ounce.
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Questions people actually ask
- How many US fluid ounces are in a cubic inch?
- 0.55411255. Exactly one 128th of a US gallon, which makes it 29.5735295625 ml exactly. The imperial fluid ounce is a different unit at exactly 28.4130625 ml, so a UK recipe calling for 10 fl oz means 284 ml and a US one means 296 ml. It is also a volume, not a weight: an ounce of flour is not a fluid ounce of flour.
- How do I convert US fluid ounces back to cubic inches?
- Divide by 0.55411255, or multiply by 1.8046875 — they are the same operation.
Other volume conversions
US fluid ounces to cubic inches — the same conversion the other way.