What is US fluid ounce?
A US fluid ounce is a volume unit equal to approximately 29.57 millilitres. It is used in the United States for beverage servings, cooking measurements, and product labelling.
Real-world uses
US fluid ounces are used for beverage labelling (a standard can of soda is 12 fl oz), cooking measurements, and cosmetics packaging in the United States. Cocktail recipes and bartending rely heavily on fluid ounce measurements (a standard shot is 1.5 fl oz).
History
The US fluid ounce derives from the English wine gallon tradition. When the US and UK diverged in measurement standards in the 19th century, their fluid ounces ended up slightly different. The US fluid ounce is defined as 1/128 of a US gallon.
Common mistakes
Confusing US fluid ounces with Imperial fluid ounces—they differ by about 4% (US: 29.57 mL, Imperial: 28.41 mL). Also, confusing fluid ounces (volume) with avoirdupois ounces (weight), which are completely different measurements.
What is cubic metre?
A cubic metre is the SI unit of volume, equal to a cube with one-metre sides. It is used in construction, water supply, industrial gas storage, and large-scale fluid measurement.
Real-world uses
Cubic metres are used for water and natural gas billing, concrete volumes in construction, shipping container capacities, and lumber measurement. Swimming pools, reservoirs, and water tanks are specified in m³. One m³ of water weighs one metric tonne.
History
The cubic metre is an SI-derived unit following naturally from the metre. It became the standard volume unit for large quantities in engineering and commerce. Water utilities worldwide adopted it as their billing unit, replacing older local measurements.
Common mistakes
Forgetting that 1 m³ = 1,000 litres, not 100. Also, confusing cubic metres with square metres—m³ is volume while m² is area. A small error in linear dimensions leads to large volumetric errors because volume scales cubically.
When is this conversion used?
Converting between US fluid ounce and cubic metre is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region.
Worked examples
1 US fluid ounce = 0.00002957 cubic metre
1 cubic metre = 1,000 litre
How to convert US fluid ounce to cubic metre
To convert US fluid ounce to cubic metre, multiply the value by 0.00002957.
To convert cubic metre back to US fluid ounce, multiply by 33,814.02270184.
Measurement standards
The cubic metre is the SI derived unit of volume. The litre, equal to exactly one cubic decimetre (0.001 m³), is accepted by the BIPM for use alongside SI units. Both the lowercase "l" and uppercase "L" are approved symbols for the litre.
Did you know?
An Olympic swimming pool holds 2,500 cubic metres of water — about 2.5 million litres. The Amazon River discharges roughly 209,000 cubic metres per second, enough to fill 84 Olympic pools every single second.
Quick reference: US fluid ounce to cubic metre
| US fluid ounce | cubic metre |
|---|---|
| 0.1 | 0.00000296 |
| 0.5 | 0.00001479 |
| 1 | 0.00002957 |
| 2 | 0.00005915 |
| 5 | 0.00014787 |
| 10 | 0.00029574 |
| 25 | 0.00073934 |
| 50 | 0.00147868 |
| 100 | 0.00295735 |
| 250 | 0.00739338 |
| 500 | 0.01478676 |
| 1,000 | 0.02957353 |
Common values
| US fluid ounce | cubic metre | |
|---|---|---|
| A teaspoon | 0.16907011 US fluid ounce | 0.000005 cubic metre |
| A cup of coffee | 8.45350568 US fluid ounce | 0.00025 cubic metre |
| A water bottle | 16.90701135 US fluid ounce | 0.0005 cubic metre |
| A bathtub | 10,144.20681055 US fluid ounce | 0.3 cubic metre |
| A swimming pool (Olympic) | 84,535,056.7546075 US fluid ounce | 2,500 cubic metre |
Available Volume units
More US fluid ounce conversions
- Convert US fluid ounce to litre
- Convert US fluid ounce to millilitre
- Convert US fluid ounce to US gallon
- Convert US fluid ounce to cubic metre
- Convert US fluid ounce to Imperial gallon
- Convert US fluid ounce to Imperial fluid ounce
- Convert US fluid ounce to teaspoon (metric)
- Convert US fluid ounce to tablespoon (metric)
- Convert US fluid ounce to cubic centimetre