Conversion formula

The conversion factor from fluid ounces to gallons is 0.0078125, which means that 1 fluid ounce is equal to 0.0078125 gallons:

1 fl oz = 0.0078125 gal

To convert 398 fluid ounces into gallons we have to multiply 398 by the conversion factor in order to get the volume amount from fluid ounces to gallons. We can also form a simple proportion to calculate the result:

1 fl oz → 0.0078125 gal

398 fl oz → V_(gal)

Solve the above proportion to obtain the volume V in gallons:

V_(gal) = 398 fl oz × 0.0078125 gal

V_(gal) = 3.109375 gal

The final result is:

398 fl oz → 3.109375 gal

We conclude that 398 fluid ounces is equivalent to 3.109375 gallons:

398 fluid ounces = 3.109375 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.32160804020101 × 398 fluid ounces.

Another way is saying that 398 fluid ounces is equal to 1 ÷ 0.32160804020101 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that three hundred ninety-eight fluid ounces is approximately three point one zero nine gallons:

398 fl oz ≅ 3.109 gal

An alternative is also that one gallon is approximately zero point three two two times three hundred ninety-eight fluid ounces.

Conversion table

fluid ounces to gallons chart

For quick reference purposes, below is the conversion table you can use to convert from fluid ounces to gallons