662 dry gallons in imperial gallons
Result
The conversion result is: 662 dry gallons is equivalent to 641.437599411653 imperial gallons.[1]
Conversion formula
How to convert 662 dry gallons to imperial gallons?
We know (by definition) that: 1 drygallon ≈ 0.968938971920925 imperialgallon.
We can set up a proportion to solve for the number of imperial gallons.
1 drygallon / 662 drygallon ≈ 0.968938971920925 imperialgallon / x imperialgallon
Now, we cross multiply to solve for our unknown x:
x imperialgallon ≈ (662 drygallon / 1 drygallon) * 0.968938971920925 imperialgallon → x imperialgallon ≈ 641.4375994116524 imperialgallon
Conclusion:
662 drygallon ≈ 641.4375994116524 imperialgallon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 imperial gallon is equal to 0.00155899810194668 times 662 dry gallons.
It can also be expressed as: 662 dry gallons is equal to 1 / 0.00155899810194668 imperial gallons.
Approximation
An approximate numerical result would be: six hundred and sixty-two dry gallons is about six hundred and forty-one point four four imperial gallons, or alternatively, a imperial gallon is about zero times six hundred and sixty-two dry gallons.
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.