Convert Tonnes-force per Cubic Metre to kN/m³
1 tonne-force per cubic metre (tf/m³) = 9.80665 kilonewtons per cubic metre (kN/m³). 1 kN/m³ = 0.1019716213 tf/m³. Example: 1.8 tf/m³ = 1.8 × 9.80665 = 17.65197 kN/m³.
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1 tf/m³ = 9.80665 kN/m³
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk tonne-force per cubic metre to kilonewton per cubic metre converter to paste a column from Excel.
How to Convert Tonne-force per Cubic Metre to Kilonewton per Cubic Metre
- 1 tf/m³ = 9.80665 kN/m³
- 1 kN/m³ = 0.1019716213 tf/m³
- Example: convert 1.8 tf/m³ to kN/m³: 1.8 tf/m³ = 1.8 × 9.80665 kN/m³ = 17.65197 kN/m³
Formula
kN/m³ = tf/m³ × 9.80665
Derivation from SI units:
- 1 tf/m³ = 1000 kgf/m³ = 9806.65 N/m³.
- 1 kN/m³ = 1000 N/m³.
- 1 tf/m³ = 9806.65 N/m³ ÷ 1000 N/m³ per kN/m³ = 9.80665 kN/m³
Both units are defined exactly, so the factor is exact. Tonne-force per Cubic Metre definition: tonne-force per cubic metre; Kilonewton per Cubic Metre definition: kilonewton per cubic metre.
Worked examples
- A soil of 1.8 tf/m³ is 17.65197 kN/m³.
1.8 tf/m³ × 9.80665 = 17.65197 kN/m³ - Concrete at 2.4 tf/m³ is 23.53596 kN/m³.
2.4 tf/m³ × 9.80665 = 23.53596 kN/m³
Tonne-force per Cubic Metre to Kilonewton per Cubic Metre conversion table
| Tonnes-force per Cubic Metre (tf/m³) | Kilonewtons per Cubic Metre (kN/m³) |
|---|---|
| 1 tf/m³ | 9.80665 kN/m³ |
| 1.6 tf/m³ | 15.69064 kN/m³ |
| 1.8 tf/m³ | 17.65197 kN/m³ |
| 1.9 tf/m³ | 18.632635 kN/m³ |
| 2 tf/m³ | 19.6133 kN/m³ |
| 2.2 tf/m³ | 21.57463 kN/m³ |
| 2.4 tf/m³ | 23.53596 kN/m³ |
| 2.5 tf/m³ | 24.516625 kN/m³ |
| 7.85 tf/m³ | 76.9822025 kN/m³ |
| 13.6 tf/m³ | 133.37044 kN/m³ |
Where it's used
Unit weights in t/m³ (tf/m³) from older MKS texts are converted to kN/m³. Multiply by 9.80665.
Tonne-force per Cubic Metre to other unit weight units
| Conversion | 1 tf/m³ equals |
|---|---|
| tonne-force per cubic metre to kilonewton per cubic metre | 9.80665 kN/m³ |
| tonne-force per cubic metre to pcf | 62.42796058 lbf/ft³ |
| tonne-force per cubic metre to newton per cubic metre | 9806.65 N/m³ |
| tonne-force per cubic metre to kilogram-force per cubic metre | 1000 kgf/m³ |
| tonne-force per cubic metre to gram-force per cubic centimetre | 1 gf/cm³ |
| tonne-force per cubic metre to pound-force per cubic inch | 0.036127292 lbf/in³ |
Frequently asked questions
Is 1 t/m³ equal to 10 kN/m³?
Almost: 1 tf/m³ = 9.80665 kN/m³; many problems round g to 10 for quick work.
How many kilonewtons per cubic metre are in 1 tonne-force per cubic metre?
1 tf/m³ = 9.80665 kN/m³.
How do I convert tonnes-force per cubic metre to kilonewtons per cubic metre?
Multiply the value in tf/m³ by 9.80665. For example, 1.8 tf/m³ × 9.80665 = 17.65197 kN/m³.
Is the tf/m³ to kN/m³ conversion exact?
Yes. Both units are defined exactly, and 1 tf/m³ is exactly 9.80665 kN/m³.
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, "kilogram-force".
- 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 Tonnes-force per Cubic Metre to kN/m³. Retrieved October 29, 2026, from https://scientificconverters.com/specific-weight/tonnes-force-per-cubic-meter-to-kilonewtons-per-cubic-meter/
IEEE
Scientific Converters, "Convert Tonnes-force per Cubic Metre to kN/m³," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/specific-weight/tonnes-force-per-cubic-meter-to-kilonewtons-per-cubic-meter/