The result of your conversion between nanogram/milliliter and grain/gallon [US] appears here
To convert between Nanogram/milliliter and Grain/gallon [US] you have to do the following:
First divide 1.0E-12/0.000001 / ((0.45359237/16)*(192/175)/480)/0.0037854118 = 0.00005842
Then multiply the amount of Nanogram/milliliter you want to convert to Grain/gallon [US], use the chart below to guide you.
Symbol:
No description
Symbol:
No description