Convert Pounds per Gallon to Grams per Cubic Centimeter

Formula

g/cm³ = lb/gal × 0.1198264273169

or g/cm³ = lb/gal ÷ 8.345404452019

Derivation from SI units:

• 1 lb/gal = 0.45359237 kg ÷ 0.003785411784 m³ = 119.8264273 kg/m³
• 1 g/cm³ = 10⁻³ kg ÷ 10⁻⁶ m³ = 1000 kg/m³
• 1 lb/gal = 119.8264273169 kg/m³ ÷ 1000 kg/m³ per g/cm³ = 0.1198264273169 g/cm³

Both units are defined exactly, so the factor is exact. Pound per Gallon definition: pound per gallon; Gram per Cubic Centimeter definition: gram per cubic centimeter.

Worked examples

1. Water at about 8.34 lb/gal is 0.9993524038 g/cm³.
   8.34 lb/gal × 0.1198264273 = 0.9993524038 g/cm³
2. A 12 lb/gal drilling mud has a density of 1.437917128 g/cm³.
   12 lb/gal × 0.1198264273 = 1.437917128 g/cm³

Where it's used

Drilling-mud weights and liquid densities in lb/gal (ppg) are converted to g/cm³ or specific gravity. Divide by about 8.345.

Pound per Gallon to other density units

Frequently asked questions

Sources

• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound per gallon (U.S.)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefixes.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.