Cubic metric volume unit.
Cubic Millimeters to Fluid ounces Converter — mm3 to fl oz
Convert Cubic Millimeter (mm3) to Fluid ounce (fl oz) using the exact conversion factor (1 cubic millimeter = 0.000033814 fluid ounce). See the formula, worked examples, conversion table, history, and common uses.
Cubic Millimeters to Fluid ounces 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.
A US fluid ounce is 1/128 of a US gallon.
Result = input x 1e-9 / 2.95735296e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic Millimeters to Fluid ounces
Cubic Millimeter and Fluid ounce 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. Specifically: Cubic metric volume unit, and a US fluid ounce is 1/128 of a US gallon.
Formula
fluid ounces = cubic millimeters × 0.0000338140227018
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic millimeter equals 1e-9 base units, and 1 fluid ounce equals 0.0000295735295625 base units, so dividing one by the other gives the direct cubic millimeter-to-fluid ounce factor of 0.0000338140227018.
Simple example
1 mm3 × 0.0000338140227 = 0.000033814 fl oz
1 cubic millimeter = 0.000033814 fluid ounces.
Real-world example
10 mm3 × 0.0000338140227 = 0.0003381402 fl oz
10 cubic millimeters = 0.0003381402 fluid ounces.
Conversion table
| Cubic Millimeter (mm3) | Fluid ounce (fl oz) |
|---|---|
| 1 mm3 | 0.000033814 fl oz |
| 5 mm3 | 0.0001690701 fl oz |
| 10 mm3 | 0.0003381402 fl oz |
| 25 mm3 | 0.0008453506 fl oz |
| 50 mm3 | 0.0016907011 fl oz |
| 100 mm3 | 0.0033814023 fl oz |
Reverse conversion: Fluid ounce to Cubic Millimeter
0.000033814 fl oz × 29573.52956 = 0.9999993286 mm3
0.000033814 fluid ounces = 0.9999993286 cubic millimeters.
cubic millimeters = fluid ounces × 29573.5295625
For a page dedicated to this direction, see Fluid ounce to Cubic Millimeter.
Understanding the Cubic Millimeter (mm3)
Cubic metric volume unit.
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.
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 fluid ounces are in 1 cubic millimeter?
1 cubic millimeter equals 0.000033814 fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert cubic millimeter to fluid ounce?
Multiply the cubic millimeter value by 0.0000338140227. The converter above does this instantly to whatever precision you set.
How do I convert fluid ounce back to cubic millimeter?
Use the reverse factor: 1 fluid ounce equals 29,573.52956 cubic millimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic millimeter?
Cubic Millimeter (mm3) is a unit of volume.
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.
Is the cubic millimeter to fluid ounce 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.