US Fluid Ounces vs. Imperial Fluid Ounces
Fluid ounces vary in definition between the US customary and imperial systems.
| US Customary System | Imperial System |
|---|---|
| 1 fl oz = 29.5735 mL | 1 fl oz = 28.4131 mL |
| 1 US cup = 8 fl oz | 1 Imperial cup = 10 fl oz |
| 1 US liquid pint = 16 fl oz | 1 Imperial pint = 20 fl oz |
| 1 US liquid quart = 32 fl oz | 1 Imperial quart = 40 fl oz |
| 1 US gallon = 128 fl oz | 1 Imperial gallon = 160 fl oz |
Note: In both the systems, the pint, quart, and cup have the same definitions corresponding to gallon.
- 1 gallon = 4 quarts = 8 pints = 16 cups
- 1 gallon = 4 quarts
- 1 quart = 2 pints
- 1 pint = 2 cups
The US fluid ounce is tied to the US gallon, and the imperial fluid ounce relates to the imperial gallon. Both the American fluid ounce and the Imperial fluid ounce are based on different historical standards, and the liquids used for their definitions are as follows:
- American fluid ounce: Originally defined as the volume occupied by an ounce of wine.
- Imperial fluid ounce: Defined as the volume occupied by an ounce of water.
These definitions have led to a slight difference in the volume of a fluid ounce in the American and Imperial systems. The American fluid ounce is slightly larger than the Imperial fluid ounce due to the difference in the density of wine and water.
What Is Fluid Ounce?
A fluid ounce, abbreviated as fl oz, is a unit to measure the liquid capacity or liquid volume in the imperial system and the US customary system of measurement.
- 1 US fluid ounce = 29.574 mL
- 1 imperial fl oz = 28.413 mL
This measurement is particularly useful for everyday tasks like measuring liquids, beverages, cooking ingredients, and personal care products. The unit fluid ounce is commonly used in many American recipes and labels.
A fluid ounce (abbreviated as “fl oz”) is a unit of volume measurement primarily used in the United States and the Imperial system.
A fluid ounce (fl oz) is indeed a relatively small volume measurement. As mentioned above, the conversion between fluid ounces and milliliters based on the US customary system of measurement is as follows:
1 fluid ounce (US) = 29.5735 milliliters (approx.)
However, in the US, a food labeling fluid ounce is precisely equivalent to 30 milliliters (mL), and it is roughly equivalent to the amount of liquid that can fill a standard medicine cup.
How to Calculate Solid Ounces to Fluid Ounces : Math Conversions
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