Conversion formula

The conversion factor from cups to fluid ounces is 8, which means that 1 cup is equal to 8 fluid ounces:

1 cup = 8 fl oz

To convert 640 cups into fluid ounces we have to multiply 640 by the conversion factor in order to get the volume amount from cups to fluid ounces. We can also form a simple proportion to calculate the result:

1 cup → 8 fl oz

640 cup → V_{(fl oz)}

Solve the above proportion to obtain the volume V in fluid ounces:

V_{(fl oz)} = 640 cup × 8 fl oz

V_{(fl oz)} = 5120 fl oz

The final result is:

640 cup → 5120 fl oz

We conclude that 640 cups is equivalent to 5120 fluid ounces:

640 cups = 5120 fluid ounces

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 fluid ounce is equal to 0.0001953125 × 640 cups.

Another way is saying that 640 cups is equal to 1 ÷ 0.0001953125 fluid ounces.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred forty cups is approximately five thousand one hundred twenty fluid ounces:

640 cup ≅ 5120 fl oz

An alternative is also that one fluid ounce is approximately zero times six hundred forty cups.

Conversion table

cups to fluid ounces chart

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