Here are the equivalents for one US fluid ounce and one imperial fluid ounce: 1 US fluid ounce equals 1/128 US gallon, 1/32 US quart, 1/16 US pint, 1/8 US cup, 1/4 US gill, 2 US tablespoons, 6 US teaspoons, 8 US fluid drams, and roughly 1.8047 cubic inches. In the SI system, this equals about 29.5735 milliliters.
1 (UK) imperial fluid ounce equals 1/160 imperial gallon, 1/40 imperial quart, 1/20 imperial pint, 1/10 imperial cup, 1/5 imperial gill, 8 imperial fluid drams, and approximately 1.7339 cubic inches. This is roughly 28.4131 milliliters in the SI system.
And again, 1 US fluid ounce is approximately equal to 1.040843 imperial fluid ounces, and 1 imperial fluid ounce is approximately equal to 0.960760 US fluid ounces.