The result of your conversion between Btu and grain/gallon [UK] appears here
To convert between Btu and Grain/gallon [UK] you have to do the following:
First divide 1055.0559 / ((0.45359237/16)*(192/175)/480)/0.00454609 = 74019.44070403
Then multiply the amount of Btu you want to convert to Grain/gallon [UK], use the chart below to guide you.
Symbol: Btu
No description
Symbol: gr/gal
No description