Convert Milliwatts per Metre Kelvin to BTU·in/(h·ft²·°F)
1 milliwatt per metre kelvin (mW/(m·K)) = 0.006933471799 BTU inch per hour square foot degree Fahrenheit (BTU·in/(h·ft²·°F)). 1 BTU·in/(h·ft²·°F) = 144.2278889 mW/(m·K). Example: 15 mW/(m·K) = 15 × 0.006933471799 = 0.104002077 BTU·in/(h·ft²·°F).
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1 mW/(m·K) = 0.006933471799 BTU·in/(h·ft²·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milliwatt per metre kelvin to BTU inch per hour square foot degree Fahrenheit converter to paste a column from Excel.
How to Convert Milliwatt per Metre Kelvin to BTU·in/(h·ft²·°F)
- 1 mW/(m·K) = 0.006933471799 BTU·in/(h·ft²·°F)
- 1 BTU·in/(h·ft²·°F) = 144.2278889 mW/(m·K)
- Example: convert 15 mW/(m·K) to BTU·in/(h·ft²·°F): 15 mW/(m·K) = 15 × 0.006933471799 BTU·in/(h·ft²·°F) = 0.104002077 BTU·in/(h·ft²·°F)
Formula
BTU·in/(h·ft²·°F) = mW/(m·K) × 0.006933471798516
or BTU·in/(h·ft²·°F) = mW/(m·K) ÷ 144.2278888643
Derivation from SI units:
- 1 mW/(m·K) = 0.001 W/(m·K)
- 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) ÷ 0.1442278888643 W/(m·K) per BTU·in/(h·ft²·°F) = 0.006933471798516 BTU·in/(h·ft²·°F)
Both units are defined exactly, so the factor is exact. Milliwatt per Metre Kelvin definition: milliwatt per metre kelvin; BTU·in/(h·ft²·°F) definition: BTU inch per hour square foot degree Fahrenheit.
Worked examples
- A reading of 22 mW/(m·K) converts to 0.1525363796 BTU·in/(h·ft²·°F).
22 mW/(m·K) × 0.006933471799 = 0.1525363796 BTU·in/(h·ft²·°F) - A value of 30 mW/(m·K) is 0.208004154 BTU·in/(h·ft²·°F).
30 mW/(m·K) × 0.006933471799 = 0.208004154 BTU·in/(h·ft²·°F)
Milliwatt per Metre Kelvin to BTU·in/(h·ft²·°F) conversion table
| Milliwatts per Metre Kelvin (mW/(m·K)) | BTU·in/(h·ft²·°F) |
|---|---|
| 10 mW/(m·K) | 0.06933471799 BTU·in/(h·ft²·°F) |
| 15 mW/(m·K) | 0.104002077 BTU·in/(h·ft²·°F) |
| 18 mW/(m·K) | 0.1248024924 BTU·in/(h·ft²·°F) |
| 22 mW/(m·K) | 0.1525363796 BTU·in/(h·ft²·°F) |
| 24 mW/(m·K) | 0.1664033232 BTU·in/(h·ft²·°F) |
| 26 mW/(m·K) | 0.1802702668 BTU·in/(h·ft²·°F) |
| 30 mW/(m·K) | 0.208004154 BTU·in/(h·ft²·°F) |
| 32 mW/(m·K) | 0.2218710976 BTU·in/(h·ft²·°F) |
| 35 mW/(m·K) | 0.2426715129 BTU·in/(h·ft²·°F) |
| 40 mW/(m·K) | 0.2773388719 BTU·in/(h·ft²·°F) |
Where it's used
Milliwatts per Metre Kelvin are used for insulation product data (λ-values), while BTU inch per hour square foot degree Fahrenheit appear in US insulation k-values (ASTM C177, C518). Both measure thermal conductivity (k, λ), so the conversion is a fixed factor.
Milliwatt per Metre Kelvin to other thermal conductivity units
| Conversion | 1 mW/(m·K) equals |
|---|---|
| milliwatt per metre kelvin to BTU inch per hour square foot degree Fahrenheit | 0.006933471799 BTU·in/(h·ft²·°F) |
| milliwatt per metre kelvin to watt per metre kelvin | 0.001 W/(m·K) |
| milliwatt per metre kelvin to BTU per hour foot degree Fahrenheit | 0.0005777893165 BTU/(h·ft·°F) |
| milliwatt per metre kelvin to kilocalorie per hour metre degree Celsius | 0.0008598452279 kcal/(h·m·°C) |
| milliwatt per metre kelvin to watt per centimetre kelvin | 0.00001 W/(cm·K) |
| milliwatt per metre kelvin to calorie per second centimetre degree Celsius | 0.000002390057361 cal/(s·cm·°C) |
Frequently asked questions
How many BTU inch per hour square foot degree Fahrenheit are in 1 milliwatt per metre kelvin?
1 mW/(m·K) = 0.006933471799 BTU·in/(h·ft²·°F).
How do I convert milliwatts per metre kelvin to BTU inch per hour square foot degree Fahrenheit?
Multiply the value in mW/(m·K) by 0.006933471799, or divide it by 144.2278889. For example, 15 mW/(m·K) × 0.006933471799 = 0.104002077 BTU·in/(h·ft²·°F).
Is the mW/(m·K) to BTU·in/(h·ft²·°F) 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, coherent derived units with special names.
- 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)]".
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 Milliwatts per Metre Kelvin to BTU·in/(h·ft²·°F). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/milliwatts-per-meter-kelvin-to-btu-inch-per-hour-square-foot-fahrenheit/
IEEE
Scientific Converters, "Convert Milliwatts per Metre Kelvin to BTU·in/(h·ft²·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/milliwatts-per-meter-kelvin-to-btu-inch-per-hour-square-foot-fahrenheit/