Fluid Ounce - Definitions and Equivalences

Definitions and Equivalences

Imperial fluid ounce
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
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.
30 millilitres ≈ 1.055852392 imperial fluid ounces
≈ 1.014420681 US customary fluid ounces
≈ 1.830712323 cubic inches
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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