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 138 fluid ounces into gallons we have to multiply 138 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

138 fl oz → V_(gal)

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

V_(gal) = 138 fl oz × 0.0078125 gal

V_(gal) = 1.078125 gal

The final result is:

138 fl oz → 1.078125 gal

We conclude that 138 fluid ounces is equivalent to 1.078125 gallons:

138 fluid ounces = 1.078125 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.92753623188406 × 138 fluid ounces.

Another way is saying that 138 fluid ounces is equal to 1 ÷ 0.92753623188406 gallons.

Approximate result

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

138 fl oz ≅ 1.078 gal

An alternative is also that one gallon is approximately zero point nine two eight times one hundred thirty-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