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 646 fluid ounces into gallons we have to multiply 646 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

646 fl oz → V_(gal)

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

V_(gal) = 646 fl oz × 0.0078125 gal

V_(gal) = 5.046875 gal

The final result is:

646 fl oz → 5.046875 gal

We conclude that 646 fluid ounces is equivalent to 5.046875 gallons:

646 fluid ounces = 5.046875 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.19814241486068 × 646 fluid ounces.

Another way is saying that 646 fluid ounces is equal to 1 ÷ 0.19814241486068 gallons.

Approximate result

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

646 fl oz ≅ 5.047 gal

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