The result of your conversion between attojoule and grain/gallon [UK] appears here
To convert between Attojoule and Grain/gallon [UK] you have to do the following:
First divide 1.0e-18 / ((0.45359237/16)*(192/175)/480)/0.00454609 = 0.
Then multiply the amount of Attojoule you want to convert to Grain/gallon [UK], use the chart below to guide you.
Symbol: aJ
No description
Symbol: gr/gal
No description