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 642 fluid ounces into gallons we have to multiply 642 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

642 fl oz → V_(gal)

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

V_(gal) = 642 fl oz × 0.0078125 gal

V_(gal) = 5.015625 gal

The final result is:

642 fl oz → 5.015625 gal

We conclude that 642 fluid ounces is equivalent to 5.015625 gallons:

642 fluid ounces = 5.015625 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.1993769470405 × 642 fluid ounces.

Another way is saying that 642 fluid ounces is equal to 1 ÷ 0.1993769470405 gallons.

Approximate result

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

642 fl oz ≅ 5.016 gal

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