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 644 fluid ounces into gallons we have to multiply 644 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

644 fl oz → V_(gal)

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

V_(gal) = 644 fl oz × 0.0078125 gal

V_(gal) = 5.03125 gal

The final result is:

644 fl oz → 5.03125 gal

We conclude that 644 fluid ounces is equivalent to 5.03125 gallons:

644 fluid ounces = 5.03125 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.19875776397516 × 644 fluid ounces.

Another way is saying that 644 fluid ounces is equal to 1 ÷ 0.19875776397516 gallons.

Approximate result

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

644 fl oz ≅ 5.031 gal

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