Convert Kilonewtons per Cubic Metre to lbf/in³
1 kilonewton per cubic metre (kN/m³) = 0.003683958538 pounds-force per cubic inch (lbf/in³). 1 lbf/in³ = 271.4471375 kN/m³. Example: 15 kN/m³ = 15 × 0.003683958538 = 0.05525937808 lbf/in³.
Also searched as kilonewtons per cubic metre to lbf/in3, kilonewtons per cubic metre in lbf/in3, kilonewtons per cubic metre into pounds-force per cubic inch, kN/m3 to lbf/in3, kN/m3 in pounds-force per cubic inch, kN/m3 into pound-force per cubic inch, kilonewton per cubic metre to pound-force per cubic inch, kN/m3 to pounds-force per cubic inch converter, kilonewtons per cubic meter to pounds-force per cubic inch and how many pounds-force per cubic inch in a kilonewton per cubic metre.
1 kN/m³ = 0.003683958538 lbf/in³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilonewton per cubic metre to pound-force per cubic inch converter to paste a column from Excel.
How to Convert Kilonewton per Cubic Metre to Pound-force per Cubic Inch
- 1 kN/m³ = 0.003683958538 lbf/in³
- 1 lbf/in³ = 271.4471375 kN/m³
- Example: convert 15 kN/m³ to lbf/in³: 15 kN/m³ = 15 × 0.003683958538 lbf/in³ = 0.05525937808 lbf/in³
Formula
lbf/in³ = kN/m³ × 0.003683958538347
or lbf/in³ = kN/m³ ÷ 271.4471375263
Derivation from SI units:
- 1 kN/m³ = 1000 N/m³.
- 1 lbf/in³ = 4.4482216152605 N ÷ 1.6387064 × 10⁻⁵ m³ ≈ 271,447 N/m³.
- 1 kN/m³ = 1000 N/m³ ÷ 271447.1375263 N/m³ per lbf/in³ = 0.003683958538347 lbf/in³
Both units are defined exactly, so the factor is exact. Kilonewton per Cubic Metre definition: kilonewton per cubic metre; Pound-force per Cubic Inch definition: pound-force per cubic inch.
Worked examples
- A reading of 18 kN/m³ converts to 0.06631125369 lbf/in³.
18 kN/m³ × 0.003683958538 = 0.06631125369 lbf/in³ - A value of 23 kN/m³ is 0.08473104638 lbf/in³.
23 kN/m³ × 0.003683958538 = 0.08473104638 lbf/in³
Kilonewton per Cubic Metre to Pound-force per Cubic Inch conversion table
| Kilonewtons per Cubic Metre (kN/m³) | Pounds-force per Cubic Inch (lbf/in³) |
|---|---|
| 9.81 kN/m³ | 0.03613963326 lbf/in³ |
| 10 kN/m³ | 0.03683958538 lbf/in³ |
| 16 kN/m³ | 0.05894333661 lbf/in³ |
| 18 kN/m³ | 0.06631125369 lbf/in³ |
| 19 kN/m³ | 0.06999521223 lbf/in³ |
| 20 kN/m³ | 0.07367917077 lbf/in³ |
| 23 kN/m³ | 0.08473104638 lbf/in³ |
| 24 kN/m³ | 0.08841500492 lbf/in³ |
| 25 kN/m³ | 0.09209896346 lbf/in³ |
| 78.5 kN/m³ | 0.2891907453 lbf/in³ |
Where it's used
Kilonewtons per Cubic Metre are used for soil unit weight in effective-stress and bearing-capacity problems, while pounds-force per cubic inch appear in US machine design (material weight). Both measure specific weight (unit weight) γ = ρg, so the conversion is a fixed factor.
Kilonewton per Cubic Metre to other unit weight units
| Conversion | 1 kN/m³ equals |
|---|---|
| kilonewton per cubic metre to pound-force per cubic inch | 0.003683958538 lbf/in³ |
| kilonewton per cubic metre to pcf | 6.365880354 lbf/ft³ |
| kilonewton per cubic metre to newton per cubic metre | 1000 N/m³ |
| kilonewton per cubic metre to tonne-force per cubic metre | 0.1019716213 tf/m³ |
| kilonewton per cubic metre to kilogram-force per cubic metre | 101.9716213 kgf/m³ |
| kilonewton per cubic metre to gram-force per cubic centimetre | 0.1019716213 gf/cm³ |
Frequently asked questions
How many pounds-force per cubic inch are in 1 kilonewton per cubic metre?
1 kN/m³ = 0.003683958538 lbf/in³.
How do I convert kilonewtons per cubic metre to pounds-force per cubic inch?
Multiply the value in kN/m³ by 0.003683958538, or divide it by 271.4471375. For example, 15 kN/m³ × 0.003683958538 = 0.05525937808 lbf/in³.
Is the kN/m³ to lbf/in³ 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
- 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).
- 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). Convert Kilonewtons per Cubic Metre to lbf/in³. Retrieved October 29, 2026, from https://scientificconverters.com/specific-weight/kilonewtons-per-cubic-meter-to-pounds-force-per-cubic-inch/
IEEE
Scientific Converters, "Convert Kilonewtons per Cubic Metre to lbf/in³," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-weight/kilonewtons-per-cubic-meter-to-pounds-force-per-cubic-inch/