Pounds per cubic inch to grams per gallon (US) converter on this page calculates how many grams per gallon (US) are in 'X' pounds per cubic inch (where 'X' is the number of pounds per cubic inch to convert to grams per gallon (US)). In order to convert a value from pounds per cubic inch to grams per gallon (US) (from lb/cu in to g/gal) just type the number of lb/cu in to be converted to g/gal and then click on the 'convert' button.