21 liters in US customary cups

Conversion formula
How to convert 21 liters to US customary cups?

We know (by definition) that: $1\mathrm{liter}\approx 4.22675283773038\mathrm{uscup}$

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: 21 ⁢ liter ≈ 88.76180959233797 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.0112661065 times 21 liters.

It can also be expressed as: 21 liters is equal to $\frac{1}{\mathrm{0.0112661065}}$ US customary cups.

Approximation

An approximate numerical result would be: twenty-one liters is about eighty-eight point seven six US customary cups, or alternatively, a US customary cup is about zero point zero one times twenty-one liters.