21 US customary cups in imperial quarts

Conversion formula
How to convert 21 US customary cups to imperial quarts?

We know (by definition) that: $1\mathrm{uscup}\approx 0.208168546157247\mathrm{imperialquart}$

We can set up a proportion to solve for the number of imperial quarts.

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

Conclusion: 21 ⁢ uscup ≈ 4.371539469302187 ⁢ imperialquart

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial quart is equal to 0.22875236676283 times 21 US customary cups.

It can also be expressed as: 21 US customary cups is equal to $\frac{1}{\mathrm{0.22875236676283}}$ imperial quarts.

Approximation

An approximate numerical result would be: twenty-one US customary cups is about four point three seven imperial quarts, or alternatively, a imperial quart is about zero point two three times twenty-one US customary cups.