Convert BTU·in/(h·ft²·°F) to Milliwatts per Metre Kelvin
1 BTU inch per hour square foot degree Fahrenheit (BTU·in/(h·ft²·°F)) = 144.2278889 milliwatts per metre kelvin (mW/(m·K)). 1 mW/(m·K) = 0.006933471799 BTU·in/(h·ft²·°F). Example: 15 BTU·in/(h·ft²·°F) = 15 × 144.2278889 = 2163.418333 mW/(m·K).
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1 BTU·in/(h·ft²·°F) = 144.2278889 mW/(m·K)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk BTU inch per hour square foot degree Fahrenheit to milliwatt per metre kelvin converter to paste a column from Excel.
How to Convert BTU·in/(h·ft²·°F) to Milliwatt per Metre Kelvin
- 1 BTU·in/(h·ft²·°F) = 144.2278889 mW/(m·K)
- 1 mW/(m·K) = 0.006933471799 BTU·in/(h·ft²·°F)
- Example: convert 15 BTU·in/(h·ft²·°F) to mW/(m·K): 15 BTU·in/(h·ft²·°F) = 15 × 144.2278889 mW/(m·K) = 2163.418333 mW/(m·K)
Formula
mW/(m·K) = BTU·in/(h·ft²·°F) × 144.2278888643
Derivation from SI units:
- 1 BTU_IT·in/(h·ft²·°F) = 1055.05585262 J × 0.0254 m ÷ (3600 s × 0.09290304 m² × 5/9 K) = 0.1442278889 W/(m·K) (exact)
- 1 mW/(m·K) = 0.001 W/(m·K)
- 1 BTU·in/(h·ft²·°F) = 0.1442278888643 W/(m·K) ÷ 0.001 W/(m·K) per mW/(m·K) = 144.2278888643 mW/(m·K)
Both units are defined exactly, so the factor is exact. BTU·in/(h·ft²·°F) definition: BTU inch per hour square foot degree Fahrenheit; Milliwatt per Metre Kelvin definition: milliwatt per metre kelvin.
Worked examples
- A reading of 0.22 BTU·in/(h·ft²·°F) converts to 31.73013555 mW/(m·K).
0.22 BTU·in/(h·ft²·°F) × 144.2278889 = 31.73013555 mW/(m·K) - A value of 0.3 BTU·in/(h·ft²·°F) is 43.26836666 mW/(m·K).
0.3 BTU·in/(h·ft²·°F) × 144.2278889 = 43.26836666 mW/(m·K)
BTU·in/(h·ft²·°F) to Milliwatt per Metre Kelvin conversion table
| BTU·in/(h·ft²·°F) | Milliwatts per Metre Kelvin (mW/(m·K)) |
|---|---|
| 0.15 BTU·in/(h·ft²·°F) | 21.63418333 mW/(m·K) |
| 0.16 BTU·in/(h·ft²·°F) | 23.07646222 mW/(m·K) |
| 0.2 BTU·in/(h·ft²·°F) | 28.84557777 mW/(m·K) |
| 0.22 BTU·in/(h·ft²·°F) | 31.73013555 mW/(m·K) |
| 0.25 BTU·in/(h·ft²·°F) | 36.05697222 mW/(m·K) |
| 0.27 BTU·in/(h·ft²·°F) | 38.94152999 mW/(m·K) |
| 0.3 BTU·in/(h·ft²·°F) | 43.26836666 mW/(m·K) |
| 0.5 BTU·in/(h·ft²·°F) | 72.11394443 mW/(m·K) |
| 1 BTU·in/(h·ft²·°F) | 144.2278889 mW/(m·K) |
| 5 BTU·in/(h·ft²·°F) | 721.1394443 mW/(m·K) |
Where it's used
BTU·in/(h·ft²·°F) are used for US insulation k-values (ASTM C177, C518), while milliwatts per metre kelvin appear in insulation product data (λ-values). Both measure thermal conductivity (k, λ), so the conversion is a fixed factor.
BTU·in/(h·ft²·°F) to other thermal conductivity units
| Conversion | 1 BTU·in/(h·ft²·°F) equals |
|---|---|
| BTU inch per hour square foot degree Fahrenheit to milliwatt per metre kelvin | 144.2278889 mW/(m·K) |
| BTU inch per hour square foot degree Fahrenheit to watt per metre kelvin | 0.1442278889 W/(m·K) |
| BTU inch per hour square foot degree Fahrenheit to BTU per hour foot degree Fahrenheit | 0.08333333333 BTU/(h·ft·°F) |
| BTU inch per hour square foot degree Fahrenheit to kilocalorie per hour metre degree Celsius | 0.124013662 kcal/(h·m·°C) |
| BTU inch per hour square foot degree Fahrenheit to watt per centimetre kelvin | 0.001442278889 W/(cm·K) |
| BTU inch per hour square foot degree Fahrenheit to calorie per second centimetre degree Celsius | 0.0003447129275 cal/(s·cm·°C) |
Frequently asked questions
How many milliwatts per metre kelvin are in 1 BTU inch per hour square foot degree Fahrenheit?
1 BTU·in/(h·ft²·°F) = 144.2278889 mW/(m·K).
How do I convert BTU inch per hour square foot degree Fahrenheit to milliwatts per metre kelvin?
Multiply the value in BTU·in/(h·ft²·°F) by 144.2278889. For example, 15 BTU·in/(h·ft²·°F) × 144.2278889 = 2163.418333 mW/(m·K).
Is the BTU·in/(h·ft²·°F) to mW/(m·K) 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, "British thermal unit_IT inch per hour square foot degree Fahrenheit [Btu_IT · in/(h · ft² · °F)]".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, coherent derived units with special names.
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 BTU·in/(h·ft²·°F) to Milliwatts per Metre Kelvin. Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/btu-inch-per-hour-square-foot-fahrenheit-to-milliwatts-per-meter-kelvin/
IEEE
Scientific Converters, "Convert BTU·in/(h·ft²·°F) to Milliwatts per Metre Kelvin," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/btu-inch-per-hour-square-foot-fahrenheit-to-milliwatts-per-meter-kelvin/