## Conversion formula

The conversion factor from cups to gallons is 0.0625, which means that 1 cup is equal to 0.0625 gallons:

1 cup = 0.0625 gal

To convert 644 cups into gallons we have to multiply 644 by the conversion factor in order to get the volume amount from cups to gallons. We can also form a simple proportion to calculate the result:

1 cup → 0.0625 gal

644 cup → V(gal)

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

V(gal) = 644 cup × 0.0625 gal

V(gal) = 40.25 gal

The final result is:

644 cup → 40.25 gal

We conclude that 644 cups is equivalent to 40.25 gallons:

644 cups = 40.25 gallons

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.024844720496894 × 644 cups.

Another way is saying that 644 cups is equal to 1 ÷ 0.024844720496894 gallons.

## Approximate result

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

644 cup ≅ 40.25 gal

An alternative is also that one gallon is approximately zero point zero two five times six hundred forty-four cups.

## Conversion table

### cups to gallons chart

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

cups (cup) gallons (gal)
645 cups 40.313 gallons
646 cups 40.375 gallons
647 cups 40.438 gallons
648 cups 40.5 gallons
649 cups 40.563 gallons
650 cups 40.625 gallons
651 cups 40.688 gallons
652 cups 40.75 gallons
653 cups 40.813 gallons
654 cups 40.875 gallons