21 US gallons in dry gallons

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

We know (by definition) that: $1\mathrm{usgallon}\approx 0.859367007375303\mathrm{drygallon}$

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 ⁢ usgallon ≈ 18.046707154881364 ⁢ drygallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 dry gallon is equal to 0.0554117707689136 times 21 US gallons.

It can also be expressed as: 21 US gallons is equal to $\frac{1}{\mathrm{0.0554117707689136}}$ dry gallons.

Approximation

An approximate numerical result would be: twenty-one US gallons is about eighteen point zero five dry gallons, or alternatively, a dry gallon is about zero point zero six times twenty-one US gallons.