Fluid ounce
Definitions and equivalences

1 imperial fluid ounce
=
​1⁄160
imperial gallon
-
=
​1⁄40
imperial quart
-
=
​1⁄20
imperial pint
-
=
​1⁄10
imperial cup
-
=
​1⁄5
imperial gill
-
=
8
imperial fluid drams
-
=
28.4130625
millilitres
-
≈
1.733871455
cubic inches
-
≈
0.960759940
US fluid ounces
-
≈
the volume of 1 avoirdupois ounce of water
the volume of 1 avoirdupois ounce of water

Question: How much is an imperial fluid ounce in ml?
Answer: The imperial fluid ounce is exactly 28.4130625 ml.