21 dry gallons in imperial gallons

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

We know (by definition) that: $1\mathrm{drygallon}\approx 0.968938971920925\mathrm{imperialgallon}$

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

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

Conclusion: 21 ⁢ drygallon ≈ 20.347718410339425 ⁢ imperialgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial gallon is equal to 0.0491455592137476 times 21 dry gallons.

It can also be expressed as: 21 dry gallons is equal to $\frac{1}{\mathrm{0.0491455592137476}}$ imperial gallons.

Approximation

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