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 18 fluid ounces into cups we have to multiply 18 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

18 fl oz → V_(cup)

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

V_(cup) = 18 fl oz × 0.125 cup

V_(cup) = 2.25 cup

The final result is:

18 fl oz → 2.25 cup

We conclude that 18 fluid ounces is equivalent to 2.25 cups:

18 fluid ounces = 2.25 cups

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cup is equal to 0.44444444444444 × 18 fluid ounces.

Another way is saying that 18 fluid ounces is equal to 1 ÷ 0.44444444444444 cups.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eighteen fluid ounces is approximately two point two five cups:

18 fl oz ≅ 2.25 cup

An alternative is also that one cup is approximately zero point four four four times eighteen 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