Convert Pounds-force per Cubic Inch to tf/m³
1 pound-force per cubic inch (lbf/in³) = 27.67990471 tonnes-force per cubic metre (tf/m³). 1 tf/m³ = 0.036127292 lbf/in³. Example: 15 lbf/in³ = 15 × 27.67990471 = 415.1985707 tf/m³.
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1 lbf/in³ = 27.67990471 tf/m³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk pound-force per cubic inch to tonne-force per cubic metre converter to paste a column from Excel.
How to Convert Pound-force per Cubic Inch to Tonne-force per Cubic Metre
- 1 lbf/in³ = 27.67990471 tf/m³
- 1 tf/m³ = 0.036127292 lbf/in³
- Example: convert 15 lbf/in³ to tf/m³: 15 lbf/in³ = 15 × 27.67990471 tf/m³ = 415.1985707 tf/m³
Formula
tf/m³ = lbf/in³ × 27.6799047102
Derivation from SI units:
- 1 lbf/in³ = 4.4482216152605 N ÷ 1.6387064 × 10⁻⁵ m³ ≈ 271,447 N/m³.
- 1 tf/m³ = 1000 kgf/m³ = 9806.65 N/m³.
- 1 lbf/in³ = 271447.1375263 N/m³ ÷ 9806.65 N/m³ per tf/m³ = 27.6799047102 tf/m³
Both units are defined exactly, so the factor is exact. Pound-force per Cubic Inch definition: pound-force per cubic inch; Tonne-force per Cubic Metre definition: tonne-force per cubic metre.
Worked examples
- A reading of 0.15 lbf/in³ converts to 4.151985707 tf/m³.
0.15 lbf/in³ × 27.67990471 = 4.151985707 tf/m³ - A value of 0.284 lbf/in³ is 7.861092938 tf/m³.
0.284 lbf/in³ × 27.67990471 = 7.861092938 tf/m³
Pound-force per Cubic Inch to Tonne-force per Cubic Metre conversion table
| Pounds-force per Cubic Inch (lbf/in³) | Tonnes-force per Cubic Metre (tf/m³) |
|---|---|
| 0.0361 lbf/in³ | 0.99924456 tf/m³ |
| 0.05 lbf/in³ | 1.383995236 tf/m³ |
| 0.1 lbf/in³ | 2.767990471 tf/m³ |
| 0.15 lbf/in³ | 4.151985707 tf/m³ |
| 0.2 lbf/in³ | 5.535980942 tf/m³ |
| 0.26 lbf/in³ | 7.196775225 tf/m³ |
| 0.284 lbf/in³ | 7.861092938 tf/m³ |
| 0.3 lbf/in³ | 8.303971413 tf/m³ |
| 0.32 lbf/in³ | 8.857569507 tf/m³ |
| 0.41 lbf/in³ | 11.34876093 tf/m³ |
Where it's used
Pounds-force per Cubic Inch are used for US machine design (material weight), while tonnes-force per cubic metre appear in older Indian soil-mechanics texts. 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 tonne-force per cubic metre | 27.67990471 tf/m³ |
| 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 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 tonnes-force per cubic metre are in 1 pound-force per cubic inch?
1 lbf/in³ = 27.67990471 tf/m³.
How do I convert pounds-force per cubic inch to tonnes-force per cubic metre?
Multiply the value in lbf/in³ by 27.67990471. For example, 15 lbf/in³ × 27.67990471 = 415.1985707 tf/m³.
Is the lbf/in³ to tf/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".
- 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, "kilogram-force".
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 tf/m³. Retrieved October 29, 2026, from https://scientificconverters.com/specific-weight/pounds-force-per-cubic-inch-to-tonnes-force-per-cubic-meter/
IEEE
Scientific Converters, "Convert Pounds-force per Cubic Inch to tf/m³," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-weight/pounds-force-per-cubic-inch-to-tonnes-force-per-cubic-meter/