How to convert 664 US gallons to imperial quarts?
We know (by definition) that:
We can set up a proportion to solve for the number of imperial quarts.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 imperial quart is equal to 0.000452164881590683 times 664 US gallons.
It can also be expressed as: 664 US gallons is equal to imperial quarts.
An approximate numerical result would be: six hundred and sixty-four US gallons is about two thousand, two hundred and eleven point five seven imperial quarts, or alternatively, a imperial quart is about zero times six hundred and sixty-four US gallons.
 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.