Definitions and Equivalences
- Imperial fluid ounce
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1 imperial fluid ounce = 1⁄160 imperial gallon = 1⁄20 imperial pint = 1⁄5 imperial gill = 8 imperial fluid drams ≈ 28.4130625 millilitres (cm3) ≈ 1.733871455 cubic inches = 1 ounce avoirdupois of water at 62 °F (16.7 °C) ≈ 0.960759940 US fluid ounce
- US customary fluid ounce
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1 US fluid ounce = 1⁄128 US gallon = 1⁄32 US quart = 1⁄16 US pint = 1⁄8 US cup = 1⁄4 US gill = 2 tablespoons = 6 teaspoons = 8 US fluid drams ≡ 1.8046875 cubic inches ≡ 29.5735295625 millilitres (or the same number of cubic centimetres (cm3)) ≈ 1.040842731 imperial fluid ounces ≈ 1.041 ounce avoirdupois (29.5 g) of water at 62 °F (16.7 °C)
- US food labelling fluid ounce
- US regulation 21 CFR 101.9(b)(5)(viii) also defines a fluid ounce as exactly 30 millilitres, but this is for use in nutrition labeling only.
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30 millilitres ≈ 1.055852392 imperial fluid ounces ≈ 1.014420681 US customary fluid ounces ≈ 1.830712323 cubic inches
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- Other useful conversions
Given the definitions above, the number of US fluid ounces in one litre is:
- 1 fl oz⁄29.57353 mL × 1000 mL⁄L = 33.8140 fl oz⁄L
There are thus about 34 customary US fluid ounces in one litre.
Similarly, there are exactly 33 1⁄3 US food-labelling fluid ounces in a litre.
Read more about this topic: Fluid Ounce
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