US fluid ounces to Cubic inches Converter
Convert US fluid ounces (fl oz) to Cubic inches (in³) instantly, or use the conversion table below to look up common values.
US fluid ounces to Cubic inches conversion table
| US fluid ounces (fl oz) | Cubic inches (in³) |
|---|---|
| 1 | 1.804688 |
| 2 | 3.609375 |
| 3 | 5.414062 |
| 4 | 7.21875 |
| 5 | 9.023438 |
| 10 | 18.046875 |
| 25 | 45.117188 |
| 50 | 90.234375 |
| 100 | 180.46875 |
How to convert US fluid ounces to Cubic inches
1 fl oz equals 1.804688 in³. Use the converter above for any value, or read the table for common conversions.
in³ = fl oz × 1.8046875 · fl oz = in³ × 0.5541125541125541Multiply a us fluid ounces figure by 1.804688 to get cubic inches, or divide it by 0.554113 to go the other way.
Worked examples
- 1 fl oz= 1.804688 in³
- 2 fl oz= 3.609375 in³
- 5 fl oz= 9.023438 in³
- 10 fl oz= 18.046875 in³
- 20 fl oz= 36.09375 in³
What these units are
US fluid ounces (fl oz). A US fluid ounce is 29.5735295625 milliliters, one sixteenth of a US pint. It is used for drinks, spirits and recipe measures in the United States.
Cubic inches (in³). A cubic inch is 16.387064 milliliters. It is used for engine displacement in the United States and for small volumes in imperial engineering.
US and imperial units are kept separate because they are genuinely different sizes. Confirm which system a source means before trusting a converted figure.
Converting US fluid ounces to Cubic inches in practice
Working in us fluid ounces
A US fluid ounce is exactly 29.5735295625 milliliters, one 128th of a US gallon. It measures liquid volume and is not the same as the ounce of mass.
Beverage bottles, cocktail recipes, medicine cups, infant formula and cosmetic containers are labelled in US fluid ounces in the United States, and bar measures follow the same unit.
The US fluid ounce is exactly 1/128 of a US gallon, while the imperial fluid ounce is exactly 28.4130625 milliliters. This site uses the US fluid ounce throughout, and printed results are rounded, so a round trip can change the final digit.
The classic error is reading a fluid ounce as a weight ounce, so a 12-fluid-ounce bottle is not 12 ounces of mass. Using an imperial fluid ounce in a US recipe also differs by about four percent.
The US fluid ounce works with US cups and gallons, while milliliters and liters work with metric measures. A drink recipe that mixes them needs every quantity converted, and the fluid ounce should not be swapped for the ounce of mass.
Checking a us fluid ounces to cubic inches conversion
The metric volume units are a clean decimal chain around the liter, so liters to milliliters is a shift of three places and cubic meters to liters is a shift of three the other way. Those pairs a reader can do without a converter.
Every pair that names a US or imperial liquid unit has to go through the definition first, because three of these units differ from a metric unit by amounts too large to round away: a liter is not a quart, a gallon is 3.785411784 liters in the US system and 4.54609 in the imperial one, and a US fluid ounce is not an imperial fluid ounce.
When checking a volume conversion, convert into liters and out again, or measure the container. The mistake that survives every other check is reading a US measure as the imperial unit of the same name, which changes a recipe, a fuel figure or a tank size by about a fifth.
Tanzania reference points
Real quantities, converted into the units on this page.
The 20-litre bucket or canister used to carry water in Tanzania
20 L = 676.280454 fl oz = 1,220.474882 in³
WaterAid puts the minimum daily water need per person at 20 litres, so one container is roughly one person's daily requirement.
Source: IPS News — water access in Tanzania, citing WaterAid · verified 2026-09-14
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