The result of your conversion between water [20°C] and grain/gallon [US] appears here
To convert between Water [20°C] and Grain/gallon [US] you have to do the following:
First divide 998.2 / ((0.45359237/16)*(192/175)/480)/0.0037854118 = 58312.67931451
Then multiply the amount of Water [20°C] you want to convert to Grain/gallon [US], use the chart below to guide you.
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