391 US customary cups in imperial gallons

Conversion formula
How to convert 391 US customary cups to imperial gallons?

We know (by definition) that: $1\mathrm{uscup}\approx 0.0520421365393118\mathrm{imperialgallon}$

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: 391 ⁢ uscup ≈ 20.348475386870913 ⁢ imperialgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial gallon is equal to 0.0491437309669506 times 391 US customary cups.

It can also be expressed as: 391 US customary cups is equal to $\frac{1}{\mathrm{0.0491437309669506}}$ imperial gallons.

Approximation

An approximate numerical result would be: three hundred and ninety-one US customary cups is about twenty point three five imperial gallons, or alternatively, a imperial gallon is about zero point zero five times three hundred and ninety-one US customary cups.