The result of your conversion between microgram/liter and grain/gallon [UK] appears here
To convert between Microgram/liter and Grain/gallon [UK] you have to do the following:
First divide 1.0E-9/0.001 / ((0.45359237/16)*(192/175)/480)/0.00454609 = 0.00007016
Then multiply the amount of Microgram/liter you want to convert to Grain/gallon [UK], use the chart below to guide you.
Symbol: µg/l
No description
Symbol: gr/gal
No description