Convert Pounds-force per Cubic Inch to lbf/ft³
1 pound-force per cubic inch (lbf/in³) = 1728 pounds-force per cubic foot (lbf/ft³). 1 lbf/ft³ = 0.0005787037037 lbf/in³. Example: 15 lbf/in³ = 15 × 1728 = 25920 lbf/ft³.
Also searched as pounds-force per cubic inch to lbf/ft3, pounds-force per cubic inch in lbf/ft3, pounds-force per cubic inch into pounds-force per cubic foot, lbf/in3 to lbf/ft3, lbf/in3 in pounds-force per cubic foot, lbf/in3 into pound-force per cubic foot, pound-force per cubic inch to pound-force per cubic foot, lbf/in3 to pounds-force per cubic foot converter and how many pounds-force per cubic foot in a pound-force per cubic inch.
1 lbf/in³ = 1728 lbf/ft³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk pound-force per cubic inch to pcf converter to paste a column from Excel.
How to Convert Pound-force per Cubic Inch to Pound-force per Cubic Foot
- 1 lbf/in³ = 1728 lbf/ft³
- 1 lbf/ft³ = 0.0005787037037 lbf/in³
- Example: convert 15 lbf/in³ to lbf/ft³: 15 lbf/in³ = 15 × 1728 lbf/ft³ = 25920 lbf/ft³
Formula
lbf/ft³ = lbf/in³ × 1728
Derivation from SI units:
- 1 lbf/in³ = 4.4482216152605 N ÷ 1.6387064 × 10⁻⁵ m³ ≈ 271,447 N/m³.
- 1 lbf/ft³ = 4.4482216152605 N ÷ 0.028316846592 m³ ≈ 157.087 N/m³.
- 1 lbf/in³ = 271447.1375263 N/m³ ÷ 157.0874638462 N/m³ per lbf/ft³ = 1728 lbf/ft³
Both units are defined exactly, so the factor is exact. Pound-force per Cubic Inch definition: pound-force per cubic inch; Pound-force per Cubic Foot definition: pound-force per cubic foot.
Worked examples
- A reading of 0.15 lbf/in³ converts to 259.2 lbf/ft³.
0.15 lbf/in³ × 1728 = 259.2 lbf/ft³ - A value of 0.284 lbf/in³ is 490.752 lbf/ft³.
0.284 lbf/in³ × 1728 = 490.752 lbf/ft³
Pound-force per Cubic Inch to Pound-force per Cubic Foot conversion table
| Pounds-force per Cubic Inch (lbf/in³) | Pounds-force per Cubic Foot (lbf/ft³) |
|---|---|
| 0.0361 lbf/in³ | 62.3808 lbf/ft³ |
| 0.05 lbf/in³ | 86.4 lbf/ft³ |
| 0.1 lbf/in³ | 172.8 lbf/ft³ |
| 0.15 lbf/in³ | 259.2 lbf/ft³ |
| 0.2 lbf/in³ | 345.6 lbf/ft³ |
| 0.26 lbf/in³ | 449.28 lbf/ft³ |
| 0.284 lbf/in³ | 490.752 lbf/ft³ |
| 0.3 lbf/in³ | 518.4 lbf/ft³ |
| 0.32 lbf/in³ | 552.96 lbf/ft³ |
| 0.41 lbf/in³ | 708.48 lbf/ft³ |
Where it's used
Pounds-force per Cubic Inch are used for US machine design (material weight), while pounds-force per cubic foot appear in US geotechnical reports and AASHTO design. 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
| Conversion | 1 lbf/in³ equals |
|---|---|
| pound-force per cubic inch to pcf | 1728 lbf/ft³ |
| pound-force per cubic inch to kilonewton per cubic metre | 271.4471375 kN/m³ |
| pound-force per cubic inch to newton per cubic metre | 271447.1375 N/m³ |
| pound-force per cubic inch to tonne-force per cubic metre | 27.67990471 tf/m³ |
| pound-force per cubic inch to kilogram-force per cubic metre | 27679.90471 kgf/m³ |
| pound-force per cubic inch to gram-force per cubic centimetre | 27.67990471 gf/cm³ |
Frequently asked questions
How many pounds-force per cubic foot are in 1 pound-force per cubic inch?
1 lbf/in³ = 1728 lbf/ft³.
How do I convert pounds-force per cubic inch to pounds-force per cubic foot?
Multiply the value in lbf/in³ by 1728. For example, 15 lbf/in³ × 1728 = 25920 lbf/ft³.
Is the lbf/in³ to lbf/ft³ conversion exact?
Yes. Both units are defined exactly, and 1 lbf/in³ is exactly 1728 lbf/ft³.
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".
- 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). Convert Pounds-force per Cubic Inch to lbf/ft³. Retrieved October 29, 2026, from https://scientificconverters.com/specific-weight/pounds-force-per-cubic-inch-to-pounds-force-per-cubic-foot/
IEEE
Scientific Converters, "Convert Pounds-force per Cubic Inch to lbf/ft³," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-weight/pounds-force-per-cubic-inch-to-pounds-force-per-cubic-foot/