Conversion formula

The conversion factor from fluid ounces to cups is 0.125, which means that 1 fluid ounce is equal to 0.125 cups:

1 fl oz = 0.125 cup

To convert 638 fluid ounces into cups we have to multiply 638 by the conversion factor in order to get the volume amount from fluid ounces to cups. We can also form a simple proportion to calculate the result:

1 fl oz → 0.125 cup

638 fl oz → V_(cup)

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

V_(cup) = 638 fl oz × 0.125 cup

V_(cup) = 79.75 cup

The final result is:

638 fl oz → 79.75 cup

We conclude that 638 fluid ounces is equivalent to 79.75 cups:

638 fluid ounces = 79.75 cups

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cup is equal to 0.012539184952978 × 638 fluid ounces.

Another way is saying that 638 fluid ounces is equal to 1 ÷ 0.012539184952978 cups.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred thirty-eight fluid ounces is approximately seventy-nine point seven five cups:

638 fl oz ≅ 79.75 cup

An alternative is also that one cup is approximately zero point zero one three times six hundred thirty-eight fluid ounces.

Conversion table

fluid ounces to cups chart

For quick reference purposes, below is the conversion table you can use to convert from fluid ounces to cups