How to convert 581 US gallons to imperial gallons?
We know (by definition) that:
We can set up a proportion to solve for the number of imperial gallons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 imperial gallon is equal to 0.00206703945870027 times 581 US gallons.
It can also be expressed as: 581 US gallons is equal to imperial gallons.
An approximate numerical result would be: five hundred and eighty-one US gallons is about four hundred and eighty-three point seven seven imperial gallons, or alternatively, a imperial gallon is about zero times five hundred and eighty-one 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.