1(kg/m3)= 0.001(g/cm3)= 0.0624(lb/ft3)
1(lb/ft3)= 16.02(kg/m3)
1(lb/in3)= 27679.9(kg/m3)
1(lb/gal3)= 119.826(kg/m3)
1(lb/gal3)= 99.776(kg/m3)
1(lb/bbl3)= 2.853(kg/m3)
1(B) = Specific gravity at 140/15.5°C – 130
API gravity = Specific gravity at 141.5/15.5°C – 131.5
Links: Developer Tools