645 US quarts in US customary cups

Conversion formula
How to convert 645 US quarts to US customary cups?

We know (by definition) that: $1\mathrm{usquart}\approx 4\mathrm{uscup}$

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: 645 ⁢ usquart ≈ 2580 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.000387596899224806 times 645 US quarts.

It can also be expressed as: 645 US quarts is equal to $\frac{1}{\mathrm{0.000387596899224806}}$ US customary cups.

Approximation

An approximate numerical result would be: six hundred and forty-five US quarts is about two thousand, five hundred and eighty US customary cups, or alternatively, a US customary cup is about zero times six hundred and forty-five US quarts.