Convert Milliwatts per Metre Kelvin to BTU/(h·ft·°F)
1 milliwatt per metre kelvin (mW/(m·K)) = 0.0005777893165 BTU per hour foot degree Fahrenheit (BTU/(h·ft·°F)). 1 BTU/(h·ft·°F) = 1730.734666 mW/(m·K). Example: 15 mW/(m·K) = 15 × 0.0005777893165 = 0.008666839748 BTU/(h·ft·°F).
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1 mW/(m·K) = 0.0005777893165 BTU/(h·ft·°F)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milliwatt per metre kelvin to BTU per hour foot degree Fahrenheit converter to paste a column from Excel.
How to Convert Milliwatt per Metre Kelvin to BTU/(h·ft·°F)
- 1 mW/(m·K) = 0.0005777893165 BTU/(h·ft·°F)
- 1 BTU/(h·ft·°F) = 1730.734666 mW/(m·K)
- Example: convert 15 mW/(m·K) to BTU/(h·ft·°F): 15 mW/(m·K) = 15 × 0.0005777893165 BTU/(h·ft·°F) = 0.008666839748 BTU/(h·ft·°F)
Formula
BTU/(h·ft·°F) = mW/(m·K) × 0.000577789316543
or BTU/(h·ft·°F) = mW/(m·K) ÷ 1730.734666371
Derivation from SI units:
- 1 mW/(m·K) = 0.001 W/(m·K)
- 1 BTU_IT/(h·ft·°F) = 1055.05585262 J ÷ (3600 s × 0.3048 m × 5/9 K) = 1.730734666 W/(m·K) (exact)
- 1 mW/(m·K) = 0.001 W/(m·K) ÷ 1.730734666371 W/(m·K) per BTU/(h·ft·°F) = 0.000577789316543 BTU/(h·ft·°F)
Both units are defined exactly, so the factor is exact. Milliwatt per Metre Kelvin definition: milliwatt per metre kelvin; BTU/(h·ft·°F) definition: BTU per hour foot degree Fahrenheit.
Worked examples
- A reading of 22 mW/(m·K) converts to 0.01271136496 BTU/(h·ft·°F).
22 mW/(m·K) × 0.0005777893165 = 0.01271136496 BTU/(h·ft·°F) - A value of 30 mW/(m·K) is 0.0173336795 BTU/(h·ft·°F).
30 mW/(m·K) × 0.0005777893165 = 0.0173336795 BTU/(h·ft·°F)
Milliwatt per Metre Kelvin to BTU/(h·ft·°F) conversion table
| Milliwatts per Metre Kelvin (mW/(m·K)) | BTU/(h·ft·°F) |
|---|---|
| 10 mW/(m·K) | 0.005777893165 BTU/(h·ft·°F) |
| 15 mW/(m·K) | 0.008666839748 BTU/(h·ft·°F) |
| 18 mW/(m·K) | 0.0104002077 BTU/(h·ft·°F) |
| 22 mW/(m·K) | 0.01271136496 BTU/(h·ft·°F) |
| 24 mW/(m·K) | 0.0138669436 BTU/(h·ft·°F) |
| 26 mW/(m·K) | 0.01502252223 BTU/(h·ft·°F) |
| 30 mW/(m·K) | 0.0173336795 BTU/(h·ft·°F) |
| 32 mW/(m·K) | 0.01848925813 BTU/(h·ft·°F) |
| 35 mW/(m·K) | 0.02022262608 BTU/(h·ft·°F) |
| 40 mW/(m·K) | 0.02311157266 BTU/(h·ft·°F) |
Where it's used
Milliwatts per Metre Kelvin are used for insulation product data (λ-values), while BTU per hour foot degree Fahrenheit appear in US heat transfer textbooks and ASHRAE data. 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 per hour foot degree Fahrenheit | 0.0005777893165 BTU/(h·ft·°F) |
| milliwatt per metre kelvin to watt per metre kelvin | 0.001 W/(m·K) |
| 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 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 per hour foot degree Fahrenheit are in 1 milliwatt per metre kelvin?
1 mW/(m·K) = 0.0005777893165 BTU/(h·ft·°F).
How do I convert milliwatts per metre kelvin to BTU per hour foot degree Fahrenheit?
Multiply the value in mW/(m·K) by 0.0005777893165, or divide it by 1730.734666. For example, 15 mW/(m·K) × 0.0005777893165 = 0.008666839748 BTU/(h·ft·°F).
Is the mW/(m·K) to BTU/(h·ft·°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 per hour foot degree Fahrenheit [Btu_IT/(h · ft · °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/(h·ft·°F). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/milliwatts-per-meter-kelvin-to-btu-per-hour-foot-fahrenheit/
IEEE
Scientific Converters, "Convert Milliwatts per Metre Kelvin to BTU/(h·ft·°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/milliwatts-per-meter-kelvin-to-btu-per-hour-foot-fahrenheit/