How many ounce in a gallon?

Answer 1

1 Gallon = 128 fluid ounces (volume not weight)

That's a US gallon.

An Imperial gallon is 160 ounces, but the ounces aren't the same size as US ounces. Nevertheless, an Imperial gallon is larger.

Using litres and millilitres to measure volume solves this confusion. (Of course the US doesn't use Imperial gallons, but here in Canada we did prior to going metric.)

Answer 2

1 US gallon equals 128 fluid ounces

1 Imperial gallon = 160 Imperial fluid ounces

Answer 3

There are 128 fluid ounces in one US gallon.

Answer 4

1 gallon = 128 fluid ounces

1 fluid ounce = 0.0078125 gallon

Answer 5

1 US gallon equals 128 fluid ounces

1 Imperial gallon = 160 Imperial fluid ounces

Answer 6

There are 128 ounces in a gallon.

Answer 7

A US gallon is 128 ounces