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 1645 fluid ounces into gallons we have to multiply 1645 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

1645 fl oz → V_(gal)

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

V_(gal) = 1645 fl oz × 0.0078125 gal

V_(gal) = 12.8515625 gal

The final result is:

1645 fl oz → 12.8515625 gal

We conclude that 1645 fluid ounces is equivalent to 12.8515625 gallons:

1645 fluid ounces = 12.8515625 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.077811550151976 × 1645 fluid ounces.

Another way is saying that 1645 fluid ounces is equal to 1 ÷ 0.077811550151976 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that one thousand six hundred forty-five fluid ounces is approximately twelve point eight five two gallons:

1645 fl oz ≅ 12.852 gal

An alternative is also that one gallon is approximately zero point zero seven eight times one thousand six hundred forty-five 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