How to convert 637 imperial gallons to US gallons?
We know (by definition) that:
We can set up a proportion to solve for the number of US gallons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US gallon is equal to 0.00130718082359339 times 637 imperial gallons.
It can also be expressed as: 637 imperial gallons is equal to US gallons.
An approximate numerical result would be: six hundred and thirty-seven imperial gallons is about seven hundred and sixty-five point zero zero US gallons, or alternatively, a US gallon is about zero times six hundred and thirty-seven imperial 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.