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 (US) = 119.826 kg/m³
1 lb/gal³ (UK) = 99.776 kg/m³
1 lb/bbl³ (Petroleum) = 2.853 kg/m³
°Bé = 140 / (Specific Gravity at 15.5°C) - 130
API Gravity = 141.5 / (Specific Gravity at 15.5°C) - 131.5