Fluids have amazing properties and for scientists, this sometimes becomes an addiction (like it went for Archimedes, though not a scientist). But quantity measurement regarding uncommon units has been a problem for most people. So, we are today going to do such a measurement using gallons and fluid ounces. Letâ€™s measure out **how many fluid ounces in a gallon**.

Gallon is a pretty big unit for even Litre. So a conversion between a bigger unit and a smaller unit will be problematic. So we will use an intermediate unit like ml for the fruitful conversion of both the units.

**Gallons to ml**

Millilitre is a very small unit. So we will get a bigger real number. And 1 gallon is equal to around 3785.41ml. simple

**Fluid ounces to ml**

Fluid ounces or just liquid grade ounces is also a smaller unit for fluids but it has no difference between normal ounces. And for the conversion, 1 fluid ounce is equal to 29.5735 ml.

So, how many fluid ounces in a gallon? We will now do the conversion.

So, we have gallon equivalent ml which is 3785.41 and fluid ounce equal ml which is 29.5735. dividing both of the units will give us the converted value. So, 3785.41 divided by 29.5735 gives us a whole value of 128.000 and this is the number of fluid ounces in a single gallon.

**How many fluid ounces in a gallon of water**

water is mostly used as a fluid and a sort of measurement medium. And like most fluids, it has a density of 1g/cc. This also makes it ideal for weight measurements for bigger units. And for a gallon, we already have done a conversion by using gallons and fluid ounces. We can use that too. So, by dividing gallons equivalent 3785.41 by fluid ounces equivalent 29.5735, we get a value of 128.000 and this is the required value.

So, how many fluid ounces in a gallon? 128

**how many fluid ounces in a half gallon**

We already found out that a gallon has exactly 128 equivalent ounces or fluid ounces to a similar amount. Now we have to find out how many fluid ounces is there in a half of a gallon. That is way easy. We just have to divide the main number by 2 or just calculate out the 50% of a gallon in terms of ounces. So 128 divided by 2 or 50% of 3785.41281, both gives us a value of 64 fluid ounces.

So, how many fluid ounces in a gallon? 64 in half of a gallon exactly.

**How many fluid ounces are in a half gallon**

Priorly, the total amount of fluid ounces in a gallon is what we have found out in this article. And we know the prior value. Now we have to find the total number of ounces in a half gallon. We already did that and we also have the value. And that is equal to an exact 64.000 fluid ounces in a half gallon.

Fluid ounces and gallons make measuring out liquids and fluids far better. But we have to first know the number of equivalent units in both of the given units, using an intermediate one. And we have used milliliter. And our conversion became easy and we did it.

So, ** how many fluid ounces in a gallon**? 128.