Pound-force per Cubic Foot (lbf/ft³)
Pounds-force per cubic foot (pcf) are the US unit of unit weight: water 62.4 pcf, typical soils 100–130 pcf, normal-weight concrete 145–150 pcf and steel 490 pcf.
Symbol: lbf/ft³ (ASCII: lbf/ft3)
Quantity: specific weight (unit weight) γ = ρg
SI relation: 1 lbf/ft³ = 157.0874638462 N/m³ (exact)
Derivation: 1 lbf/ft³ = 4.4482216152605 N ÷ 0.028316846592 m³ ≈ 157.087 N/m³.
Exact: yes, by definition
Typical uses
- US geotechnical reports and AASHTO design
- ACI concrete unit weight (150 pcf)
- US structural dead loads
Convert pounds-force per cubic foot to other units
| Conversion | 1 lbf/ft³ equals | Reverse |
|---|---|---|
| pcf to kilonewton per cubic metre | 0.1570874638 kN/m³ | kilonewton per cubic metre to pcf |
| pcf to newton per cubic metre | 157.0874638 N/m³ | newton per cubic metre to pcf |
| pcf to tonne-force per cubic metre | 0.01601846337 tf/m³ | tonne-force per cubic metre to pcf |
| pcf to kilogram-force per cubic metre | 16.01846337 kgf/m³ | kilogram-force per cubic metre to pcf |
| pcf to gram-force per cubic centimetre | 0.01601846337 gf/cm³ | gram-force per cubic centimetre to pcf |
| pcf to pound-force per cubic inch | 0.0005787037037 lbf/in³ | pound-force per cubic inch to pcf |
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 foot".
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 Foot (lbf/ft³). Retrieved October 29, 2026, from https://scientificconverters.com/units/pound-force-per-cubic-foot/
IEEE
Scientific Converters, "Pound-force per Cubic Foot (lbf/ft³)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/units/pound-force-per-cubic-foot/