21 US customary cups in dry gallons

Conversion formula
How to convert 21 US customary cups to dry gallons?

We know (by definition) that: $1\mathrm{uscup}\approx 0.0537104379609565\mathrm{drygallon}$

We can set up a proportion to solve for the number of dry gallons.

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

Conclusion: 21 ⁢ uscup ≈ 1.1279191971800866 ⁢ drygallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 dry gallon is equal to 0.886588332302618 times 21 US customary cups.

It can also be expressed as: 21 US customary cups is equal to $\frac{1}{\mathrm{0.886588332302618}}$ dry gallons.

Approximation

An approximate numerical result would be: twenty-one US customary cups is about one point one two dry gallons, or alternatively, a dry gallon is about zero point eight nine times twenty-one US customary cups.