Convert Pounds per Cubic Inch to Kilograms per Cubic Meter

Formula

kg/m³ = lb/in³ × 27679.9047102

Derivation from SI units:

• 1 lb/in³ = 0.45359237 kg ÷ 1.6387064 × 10⁻⁵ m³ = 27 679.9047 kg/m³
• 1 kg/m³ = 1 kg ÷ 1 m³

Both units are defined exactly, so the factor is exact. Pound per Cubic Inch definition: pound per cubic inch; Kilogram per Cubic Meter definition: kilogram per cubic meter.

Worked examples

1. A reading of 0.16 lb/in³ converts to 4428.784754 kg/m³.
   0.16 lb/in³ × 27679.90471 = 4428.784754 kg/m³
2. A value of 0.32 lb/in³ is 8857.569507 kg/m³.
   0.32 lb/in³ × 27679.90471 = 8857.569507 kg/m³

Where it's used

Pounds per Cubic Inch are used for metal densities (steel ≈ 0.284 lb/in³, aluminium ≈ 0.098 lb/in³), while kilograms per cubic meter appear in fluid properties in engineering calculations. Both measure density (mass per unit volume) and mass concentration, so the conversion is a fixed factor.

Pound per Cubic Inch 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 cubic inch (lb/in³)".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2, coherent derived units.

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