Convert Watts per Metre Kelvin to mW/(m·K)
1 watt per metre kelvin (W/(m·K)) = 1000 milliwatts per metre kelvin (mW/(m·K)). 1 mW/(m·K) = 0.001 W/(m·K). Example: 15 W/(m·K) = 15 × 1000 = 15000 mW/(m·K).
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1 W/(m·K) = 1000 mW/(m·K)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk watt per metre kelvin to milliwatt per metre kelvin converter to paste a column from Excel.
How to Convert Watt per Metre Kelvin to Milliwatt per Metre Kelvin
- 1 W/(m·K) = 1000 mW/(m·K)
- 1 mW/(m·K) = 0.001 W/(m·K)
- Example: convert 15 W/(m·K) to mW/(m·K): 15 W/(m·K) = 15 × 1000 mW/(m·K) = 15000 mW/(m·K)
Formula
mW/(m·K) = W/(m·K) × 1000
Derivation from SI units:
- The SI unit of thermal conductivity: heat flow (W) per metre of thickness per kelvin of temperature difference
- 1 mW/(m·K) = 0.001 W/(m·K)
Both units are defined exactly, so the factor is exact. Watt per Metre Kelvin definition: watt per metre kelvin; Milliwatt per Metre Kelvin definition: milliwatt per metre kelvin.
Worked examples
- A reading of 0.15 W/(m·K) converts to 150 mW/(m·K).
0.15 W/(m·K) × 1000 = 150 mW/(m·K) - A value of 16 W/(m·K) is 16000 mW/(m·K).
16 W/(m·K) × 1000 = 16000 mW/(m·K)
Watt per Metre Kelvin to Milliwatt per Metre Kelvin conversion table
| Watts per Metre Kelvin (W/(m·K)) | Milliwatts per Metre Kelvin (mW/(m·K)) |
|---|---|
| 0.024 W/(m·K) | 24 mW/(m·K) |
| 0.035 W/(m·K) | 35 mW/(m·K) |
| 0.04 W/(m·K) | 40 mW/(m·K) |
| 0.15 W/(m·K) | 150 mW/(m·K) |
| 0.6 W/(m·K) | 600 mW/(m·K) |
| 1 W/(m·K) | 1000 mW/(m·K) |
| 1.4 W/(m·K) | 1400 mW/(m·K) |
| 16 W/(m·K) | 16000 mW/(m·K) |
| 50 W/(m·K) | 50000 mW/(m·K) |
| 205 W/(m·K) | 205000 mW/(m·K) |
| 401 W/(m·K) | 401000 mW/(m·K) |
Where it's used
Watts per Metre Kelvin are used for insulation λ-values (EN 12667, ISO 8301), 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.
Watt per Metre Kelvin to other thermal conductivity units
| Conversion | 1 W/(m·K) equals |
|---|---|
| watt per metre kelvin to milliwatt per metre kelvin | 1000 mW/(m·K) |
| watt per metre kelvin to BTU per hour foot degree Fahrenheit | 0.5777893165 BTU/(h·ft·°F) |
| watt per metre kelvin to BTU inch per hour square foot degree Fahrenheit | 6.933471799 BTU·in/(h·ft²·°F) |
| watt per metre kelvin to kilocalorie per hour metre degree Celsius | 0.8598452279 kcal/(h·m·°C) |
| watt per metre kelvin to watt per centimetre kelvin | 0.01 W/(cm·K) |
| watt per metre kelvin to calorie per second centimetre degree Celsius | 0.002390057361 cal/(s·cm·°C) |
Frequently asked questions
How many milliwatts per metre kelvin are in 1 watt per metre kelvin?
1 W/(m·K) = 1000 mW/(m·K).
How do I convert watts per metre kelvin to milliwatts per metre kelvin?
Multiply the value in W/(m·K) by 1000. For example, 15 W/(m·K) × 1000 = 15000 mW/(m·K).
Is the W/(m·K) to mW/(m·K) conversion exact?
Yes. Both units are defined exactly, and 1 W/(m·K) is exactly 1000 mW/(m·K).
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.
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 Watts per Metre Kelvin to mW/(m·K). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-conductivity/watts-per-meter-kelvin-to-milliwatts-per-meter-kelvin/
IEEE
Scientific Converters, "Convert Watts per Metre Kelvin to mW/(m·K)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-conductivity/watts-per-meter-kelvin-to-milliwatts-per-meter-kelvin/