The result of your conversion between petajoule and grain/cubic inch appears here
To convert between Petajoule and Grain/cubic Inch you have to do the following:
First divide 1.0e+15 / ((0.45359237/16)*(192/175)/480)/(0.0037854118/231) = 252891045069493.71875
Then multiply the amount of Petajoule you want to convert to Grain/cubic Inch, use the chart below to guide you.
Symbol: PJ
No description
Symbol: gr/in³
No description