326 imperial cups in imperial gallons
Result
The conversion result is: 326 imperial cups is equivalent to 20.375 imperial gallons.[1]
Conversion formula
How to convert 326 imperial cups to imperial gallons?
We know (by definition) that: 1 brcup ≈ 0.0625 imperialgallon.
We can set up a proportion to solve for the number of imperial gallons.
1 brcup / 326 brcup ≈ 0.0625 imperialgallon / x imperialgallon
Now, we cross multiply to solve for our unknown x:
x imperialgallon ≈ (326 brcup / 1 brcup) * 0.0625 imperialgallon → x imperialgallon ≈ 20.375 imperialgallon
Conclusion:
326 brcup ≈ 20.375 imperialgallon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 imperial gallon is equal to 0.049079754601227 times 326 imperial cups.
It can also be expressed as: 326 imperial cups is equal to 1 / 0.049079754601227 imperial gallons.
Approximation
An approximate numerical result would be: three hundred and twenty-six imperial cups is about twenty point three seven imperial gallons, or alternatively, a imperial gallon is about zero point zero five times three hundred and twenty-six imperial cups.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.