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 400 fluid ounces into gallons we have to multiply 400 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

400 fl oz → V_(gal)

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

V_(gal) = 400 fl oz × 0.0078125 gal

V_(gal) = 3.125 gal

The final result is:

400 fl oz → 3.125 gal

We conclude that 400 fluid ounces is equivalent to 3.125 gallons:

400 fluid ounces = 3.125 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.32 × 400 fluid ounces.

Another way is saying that 400 fluid ounces is equal to 1 ÷ 0.32 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four hundred fluid ounces is approximately three point one two five gallons:

400 fl oz ≅ 3.125 gal

An alternative is also that one gallon is approximately zero point three two times four hundred 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