664 imperial gallons in US customary cups

Conversion formula
How to convert 664 imperial gallons to US customary cups?

We know (by definition) that: $1\mathrm{imperialgallon}\approx 19.2151988080777\mathrm{uscup}$

We can set up a proportion to solve for the number of US customary cups.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 664 ⁢ imperialgallon ≈ 12758.892008563595 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 7.83767116555901e-05 times 664 imperial gallons.

It can also be expressed as: 664 imperial gallons is equal to $\frac{1}{\mathrm{7.83767116555901e-05}}$ US customary cups.

Approximation

An approximate numerical result would be: six hundred and sixty-four imperial gallons is about twelve thousand, seven hundred and fifty-eight point eight eight US customary cups, or alternatively, a US customary cup is about zero times six hundred and sixty-four imperial gallons.