Convert Pounds-force per Cubic Inch to N/m³

Formula

N/m³ = lbf/in³ × 271447.1375263

Derivation from SI units:

• 1 lbf/in³ = 4.4482216152605 N ÷ 1.6387064 × 10⁻⁵ m³ ≈ 271,447 N/m³.
• Specific (unit) weight γ = ρ g, in N/m³.

Both units are defined exactly, so the factor is exact. Pound-force per Cubic Inch definition: pound-force per cubic inch; Newton per Cubic Metre definition: newton per cubic metre.

Worked examples

1. A reading of 0.15 lbf/in³ converts to 40717.07063 N/m³.
   0.15 lbf/in³ × 271447.1375 = 40717.07063 N/m³
2. A value of 0.284 lbf/in³ is 77090.98706 N/m³.
   0.284 lbf/in³ × 271447.1375 = 77090.98706 N/m³

Where it's used

Pounds-force per Cubic Inch are used for US machine design (material weight), while newtons per cubic metre appear in hydrostatic pressure p = γh. Both measure specific weight (unit weight) γ = ρg, so the conversion is a fixed factor.

Pound-force per Cubic Inch to other unit weight 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-force per cubic inch".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).

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