How to Convert Cubic centimetres to US fluid ounces (cm³ to fl oz)
Volume conversions help with baking from American recipes, comparing petrol prices quoted per gallon abroad with pump prices per litre here, and reading PUB water bills in cubic metres. This guide shows how to convert cubic centimetres into us fluid ounces by hand, with examples and a quick-reference table.
The conversion
To convert cubic centimetres to us fluid ounces, multiply the value by 0.0338140565. To go the other way, divide by the same number (or multiply by 29.5735). For a quick estimate, multiply by about 0.034.
US fluid ounces = cubic centimetres × 0.0338140565
Worked examples
- 3 cm³ = 0.101442 fl oz
- 12.5 cm³ = 0.422676 fl oz
- 75 cm³ = 2.5361 fl oz
Cubic centimetres to US fluid ounces table
| Cubic centimetres | US fluid ounces |
|---|---|
| 1 cm³ | 0.033814 fl oz |
| 2 cm³ | 0.067628 fl oz |
| 5 cm³ | 0.16907 fl oz |
| 10 cm³ | 0.338141 fl oz |
| 20 cm³ | 0.676281 fl oz |
| 25 cm³ | 0.845351 fl oz |
| 50 cm³ | 1.6907 fl oz |
| 100 cm³ | 3.3814 fl oz |
| 250 cm³ | 8.4535 fl oz |
| 500 cm³ | 16.907 fl oz |
| 1,000 cm³ | 33.8141 fl oz |
Common questions
Is cm³ to fl oz exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the US fluid ounces to Cubic centimetres converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Cubic centimetres to US fluid ounces Converter or browse all volume converters.
Run your own numbers: Cubic centimetres to US fluid ounces Converter