Convert Pounds-force per Cubic Inch to kN/m³
1 pound-force per cubic inch (lbf/in³) = 271.4471375 kilonewtons per cubic metre (kN/m³). 1 kN/m³ = 0.003683958538 lbf/in³. Example: 15 lbf/in³ = 15 × 271.4471375 = 4071.707063 kN/m³.
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1 lbf/in³ = 271.4471375 kN/m³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk pound-force per cubic inch to kilonewton per cubic metre converter to paste a column from Excel.
How to Convert Pound-force per Cubic Inch to Kilonewton per Cubic Metre
- 1 lbf/in³ = 271.4471375 kN/m³
- 1 kN/m³ = 0.003683958538 lbf/in³
- Example: convert 15 lbf/in³ to kN/m³: 15 lbf/in³ = 15 × 271.4471375 kN/m³ = 4071.707063 kN/m³
Formula
kN/m³ = lbf/in³ × 271.4471375263
Derivation from SI units:
- 1 lbf/in³ = 4.4482216152605 N ÷ 1.6387064 × 10⁻⁵ m³ ≈ 271,447 N/m³.
- 1 kN/m³ = 1000 N/m³.
- 1 lbf/in³ = 271447.1375263 N/m³ ÷ 1000 N/m³ per kN/m³ = 271.4471375263 kN/m³
Both units are defined exactly, so the factor is exact. Pound-force per Cubic Inch definition: pound-force per cubic inch; Kilonewton per Cubic Metre definition: kilonewton per cubic metre.
Worked examples
- A reading of 0.15 lbf/in³ converts to 40.71707063 kN/m³.
0.15 lbf/in³ × 271.4471375 = 40.71707063 kN/m³ - A value of 0.284 lbf/in³ is 77.09098706 kN/m³.
0.284 lbf/in³ × 271.4471375 = 77.09098706 kN/m³
Pound-force per Cubic Inch to Kilonewton per Cubic Metre conversion table
| Pounds-force per Cubic Inch (lbf/in³) | Kilonewtons per Cubic Metre (kN/m³) |
|---|---|
| 0.0361 lbf/in³ | 9.799241665 kN/m³ |
| 0.05 lbf/in³ | 13.57235688 kN/m³ |
| 0.1 lbf/in³ | 27.14471375 kN/m³ |
| 0.15 lbf/in³ | 40.71707063 kN/m³ |
| 0.2 lbf/in³ | 54.28942751 kN/m³ |
| 0.26 lbf/in³ | 70.57625576 kN/m³ |
| 0.284 lbf/in³ | 77.09098706 kN/m³ |
| 0.3 lbf/in³ | 81.43414126 kN/m³ |
| 0.32 lbf/in³ | 86.86308401 kN/m³ |
| 0.41 lbf/in³ | 111.2933264 kN/m³ |
Where it's used
Pounds-force per Cubic Inch are used for US machine design (material weight), while kilonewtons per cubic metre appear in soil unit weight in effective-stress and bearing-capacity problems. 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 kilonewton per cubic metre | 271.4471375 kN/m³ |
| pound-force per cubic inch to pcf | 1728 lbf/ft³ |
| 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 kilonewtons per cubic metre are in 1 pound-force per cubic inch?
1 lbf/in³ = 271.4471375 kN/m³.
How do I convert pounds-force per cubic inch to kilonewtons per cubic metre?
Multiply the value in lbf/in³ by 271.4471375. For example, 15 lbf/in³ × 271.4471375 = 4071.707063 kN/m³.
Is the lbf/in³ to kN/m³ conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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: . 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 kN/m³. Retrieved October 29, 2026, from https://scientificconverters.com/specific-weight/pounds-force-per-cubic-inch-to-kilonewtons-per-cubic-meter/
IEEE
Scientific Converters, "Convert Pounds-force per Cubic Inch to kN/m³," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-weight/pounds-force-per-cubic-inch-to-kilonewtons-per-cubic-meter/