Cubic metric volume unit.
Cubic Centimeters to Fluid ounces Converter — cm3 to fl oz
Convert Cubic Centimeter (cm3) to Fluid ounce (fl oz) using the exact conversion factor (1 cubic centimeter = 0.0338140227 fluid ounce). See the formula, worked examples, conversion table, history, and common uses.
Cubic Centimeters 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-6 / 2.95735296e-5.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic Centimeters to Fluid ounces
Cubic Centimeter 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 centimeters × 0.0338140227018
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic centimeter equals 0.000001 base units, and 1 fluid ounce equals 0.0000295735295625 base units, so dividing one by the other gives the direct cubic centimeter-to-fluid ounce factor of 0.0338140227018.
Simple example
1 cm3 × 0.0338140227 = 0.0338140227 fl oz
1 cubic centimeter = 0.0338140227 fluid ounces.
Real-world example
10 cm3 × 0.0338140227 = 0.338140227 fl oz
10 cubic centimeters = 0.338140227 fluid ounces.
Conversion table
| Cubic Centimeter (cm3) | Fluid ounce (fl oz) |
|---|---|
| 1 cm3 | 0.0338140227 fl oz |
| 5 cm3 | 0.1690701135 fl oz |
| 10 cm3 | 0.338140227 fl oz |
| 25 cm3 | 0.8453505675 fl oz |
| 50 cm3 | 1.690701135 fl oz |
| 100 cm3 | 3.38140227 fl oz |
Reverse conversion: Fluid ounce to Cubic Centimeter
0.0338140227 fl oz × 29.57352956 = 0.9999999999 cm3
0.0338140227 fluid ounces = 0.9999999999 cubic centimeters.
cubic centimeters = fluid ounces × 29.5735295625
For a page dedicated to this direction, see Fluid ounce to Cubic Centimeter.
Understanding the Cubic Centimeter (cm3)
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 centimeter?
1 cubic centimeter equals 0.0338140227 fluid ounces, using the exact defined conversion factor rather than an estimate.
How do I convert cubic centimeter to fluid ounce?
Multiply the cubic centimeter value by 0.0338140227. The converter above does this instantly to whatever precision you set.
How do I convert fluid ounce back to cubic centimeter?
Use the reverse factor: 1 fluid ounce equals 29.57352956 cubic centimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic centimeter?
Cubic Centimeter (cm3) 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 centimeter 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.