The result of your conversion between terajoule and grain/gallon [UK] appears here
To convert between Terajoule and Grain/gallon [UK] you have to do the following:
First divide 1.0e+12 / ((0.45359237/16)*(192/175)/480)/0.00454609 = 70156889984723.5
Then multiply the amount of Terajoule you want to convert to Grain/gallon [UK], use the chart below to guide you.
Symbol: TJ
No description
Symbol: gr/gal
No description