646 imperial gallons in US customary cups

Conversion formula
How to convert 646 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: 646 ⁢ imperialgallon ≈ 12413.018430018195 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 8.05605828781916e-05 times 646 imperial gallons.

It can also be expressed as: 646 imperial gallons is equal to $\frac{1}{\mathrm{8.05605828781916e-05}}$ US customary cups.

Approximation

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