421 US quarts in US customary cups

Conversion formula
How to convert 421 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: 421 ⁢ usquart ≈ 1684 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.000593824228028504 times 421 US quarts.

It can also be expressed as: 421 US quarts is equal to $\frac{1}{\mathrm{0.000593824228028504}}$ US customary cups.

Approximation

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