21 dry gallons in US dry barrels

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

We know (by definition) that: $1\mathrm{drygallon}\approx 0.0380955924036281\mathrm{drybarrel}$

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

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

Conclusion: 21 ⁢ drygallon ≈ 0.8000074404761901 ⁢ drybarrel

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US dry barrel is equal to 1.24998837436408 times 21 dry gallons.

It can also be expressed as: 21 dry gallons is equal to $\frac{1}{\mathrm{1.24998837436408}}$ US dry barrels.

Approximation

An approximate numerical result would be: twenty-one dry gallons is about zero point eight zero US dry barrels, or alternatively, a US dry barrel is about one point two five times twenty-one dry gallons.