A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Cubic Millimeters Converter — fl oz to mm3
Convert Fluid ounce (fl oz) to Cubic Millimeter (mm3) using the exact conversion factor (1 fluid ounce = 29,573.52956 cubic millimeter). See the formula, worked examples, conversion table, history, and common uses.
Fluid ounces to Cubic Millimeters converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
Cubic metric volume unit.
Result = input x 2.95735296e-5 / 1e-9.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Cubic Millimeters
Fluid ounce and Cubic Millimeter appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Fluid ounce is most often used for us beverage container sizing (soda, water bottles).
Formula
cubic millimeters = fluid ounces × 29573.5295625
This factor comes from each unit's defined relationship to the category's base unit: 1 fluid ounce equals 0.0000295735295625 base units, and 1 cubic millimeter equals 1e-9 base units, so dividing one by the other gives the direct fluid ounce-to-cubic millimeter factor of 29573.5295625.
Simple example
1 fl oz × 29573.52956 = 29,573.52956 mm3
1 fluid ounce = 29,573.52956 cubic millimeters.
Real-world example
10 fl oz × 29573.52956 = 295,735.2956 mm3
10 fluid ounces = 295,735.2956 cubic millimeters.
Conversion table
| Fluid ounce (fl oz) | Cubic Millimeter (mm3) |
|---|---|
| 1 fl oz | 29,573.52956 mm3 |
| 5 fl oz | 147,867.6478 mm3 |
| 10 fl oz | 295,735.2956 mm3 |
| 25 fl oz | 739,338.2391 mm3 |
| 50 fl oz | 1,478,676.478 mm3 |
| 100 fl oz | 2,957,352.956 mm3 |
Reverse conversion: Cubic Millimeter to Fluid ounce
1 mm3 × 0.0000338140227 = 0.000033814 fl oz
1 cubic millimeter = 0.000033814 fluid ounces.
fluid ounces = cubic millimeters × 0.0000338140227018
For a page dedicated to this direction, see Cubic Millimeter to Fluid ounce.
Understanding the Fluid ounce
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Where it's used: United States (beverage, nutrition labeling)
Uses of the Fluid ounce today
- US beverage container sizing (soda, water bottles)
- US nutrition and medication dosing labels
History of the Fluid ounce
The US fluid ounce follows from the same English wine-gallon system as the rest of the US liquid volume units, defined as a consistent fraction of the gallon.
Historical origin. Fluid ounce was not the invention of a single named person; it developed through the process described above.
Understanding the Cubic Millimeter (mm3)
Cubic metric volume unit.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic millimeters are in 1 fluid ounce?
1 fluid ounce equals 29,573.52956 cubic millimeters, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to cubic millimeter?
Multiply the fluid ounce value by 29573.52956. The converter above does this instantly to whatever precision you set.
How do I convert cubic millimeter back to fluid ounce?
Use the reverse factor: 1 cubic millimeter equals 0.000033814 fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a fluid ounce?
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
What is a cubic millimeter?
Cubic Millimeter (mm3) is a unit of volume.
Is the fluid ounce to cubic millimeter conversion exact?
Yes. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the fluid ounce still used today?
United States (beverage, nutrition labeling)