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 1290 gallons into cups we have to multiply 1290 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

1290 gal → V_(cup)

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

V_(cup) = 1290 gal × 16 cup

V_(cup) = 20640 cup

The final result is:

1290 gal → 20640 cup

We conclude that 1290 gallons is equivalent to 20640 cups:

1290 gallons = 20640 cups

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cup is equal to 4.8449612403101E-5 × 1290 gallons.

Another way is saying that 1290 gallons is equal to 1 ÷ 4.8449612403101E-5 cups.

Approximate result

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

1290 gal ≅ 20640 cup

An alternative is also that one cup is approximately zero times one thousand two hundred ninety 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