Conversion formula

The conversion factor from gallons to cups is 16, which means that 1 gallon is equal to 16 cups:

1 gal = 16 cup

To convert 40 gallons into cups we have to multiply 40 by the conversion factor in order to get the volume amount from gallons to cups. We can also form a simple proportion to calculate the result:

1 gal → 16 cup

40 gal → V_(cup)

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

V_(cup) = 40 gal × 16 cup

V_(cup) = 640 cup

The final result is:

40 gal → 640 cup

We conclude that 40 gallons is equivalent to 640 cups:

40 gallons = 640 cups

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cup is equal to 0.0015625 × 40 gallons.

Another way is saying that 40 gallons is equal to 1 ÷ 0.0015625 cups.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that forty gallons is approximately six hundred forty cups:

40 gal ≅ 640 cup

An alternative is also that one cup is approximately zero point zero zero two times forty gallons.

Conversion table

gallons to cups chart

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