The result of your conversion between thermie and grain/cubic foot appears here
To convert between Thermie and Grain/cubic Foot you have to do the following:
First divide 4185800 / ((0.45359237/16)*(192/175)/480)/((0.0037854118/231)*1728) = 1829176709.38886023
Then multiply the amount of Thermie you want to convert to Grain/cubic Foot, use the chart below to guide you.
Symbol: th
No description
Symbol: gr/ft³
No description