Pound-force per Cubic Inch (lbf/in³)
Pounds-force per cubic inch suit dense materials: steel is 0.284 lbf/in³ and water 0.0361 lbf/in³.
Symbol: lbf/in³ (ASCII: lbf/in3)
Quantity: specific weight (unit weight) γ = ρg
SI relation: 1 lbf/in³ = 271447.1375263 N/m³ (exact)
Derivation: 1 lbf/in³ = 4.4482216152605 N ÷ 1.6387064 × 10⁻⁵ m³ ≈ 271,447 N/m³.
Exact: yes, by definition
Typical uses
- US machine design (material weight)
- Aerospace weight estimates
Convert pounds-force per cubic inch to other units
| Conversion | 1 lbf/in³ equals | Reverse |
|---|---|---|
| pound-force per cubic inch to kilonewton per cubic metre | 271.4471375 kN/m³ | kilonewton per cubic metre to pound-force per cubic inch |
| pound-force per cubic inch to pcf | 1728 lbf/ft³ | pcf to pound-force per cubic inch |
| pound-force per cubic inch to newton per cubic metre | 271447.1375 N/m³ | newton per cubic metre to pound-force per cubic inch |
| pound-force per cubic inch to tonne-force per cubic metre | 27.67990471 tf/m³ | tonne-force per cubic metre to pound-force per cubic inch |
| pound-force per cubic inch to kilogram-force per cubic metre | 27679.90471 kgf/m³ | kilogram-force per cubic metre to pound-force per cubic inch |
| pound-force per cubic inch to gram-force per cubic centimetre | 27.67990471 gf/cm³ | gram-force per cubic centimetre to pound-force per cubic inch |
Open the Unit Weight Converter (kN/m³, pcf, kgf/m³) to convert any value between all units.
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".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Pound-force per Cubic Inch (lbf/in³). Retrieved October 29, 2026, from https://scientificconverters.com/units/pound-force-per-cubic-inch/
IEEE
Scientific Converters, "Pound-force per Cubic Inch (lbf/in³)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/pound-force-per-cubic-inch/