# Thermal Conductivity Converter (W/(m·K) / kcal / BTU) Convert thermal conductivity between W/(m·K) (watt per metre-kelvin, SI base, = W/(m·°C)), kcal/(m·h·°C) (1 = 1.1627778 W/(m·K)), and BTU/(hr·ft·°F) (1 = 1.7307347 W/(m·K)). Converts via W/(m·K) to the target unit and also lists the equivalent value in all three units for reference. Reference values: copper ≈ 401, aluminum ≈ 237, steel ≈ 50, water ≈ 0.6, air ≈ 0.026, insulation foam ≈ 0.03 W/(m·K). > Canonical page: https://elysiatools.com/en/tools/thermal-conductivity-converter - **Category:** Math & Numbers - **Keywords:** thermal conductivity, conductivity conversion, W/(m·K), watt per metre kelvin, kcal/(m·h·°C), kilocalorie, BTU/(hr·ft·°F), BTU, heat transfer, insulation, heat conduction ## Overview Convert non-negative thermal conductivity values between W/(m·K), kcal/(m·h·°C), and BTU/(hr·ft·°F). The tool converts through W/(m·K), returns the selected output unit, and lists equivalent values in all three units. ## Inputs - **Input unit** (select) - **Value** (number): Thermal conductivity in the selected Input unit. Must be non-negative. - **Output unit** (select) - **Decimal Places** (number) ## When to use - Convert SI thermal conductivity values into kcal/(m·h·°C) or BTU/(hr·ft·°F). - Translate material conductivity data between metric and imperial engineering units. - Check reference values for conductors, water, air, or insulation materials. ## How it works - Enter a non-negative thermal conductivity value. - Select the input unit: W/(m·K), kcal/(m·h·°C), or BTU/(hr·ft·°F). - Choose the output unit and set the number of decimal places from 0 to 10. - The tool converts through W/(m·K) and returns the selected result plus equivalents in all three units as JSON. ## Use cases - Compare thermal conductivity data from metric and imperial engineering references. - Convert insulation, air, water, steel, aluminum, or copper reference values for calculations. - Prepare consistently formatted conductivity values for heat-transfer and material-comparison work. ## Frequently asked questions ### Which thermal conductivity units are supported? The tool supports W/(m·K), kcal/(m·h·°C), and BTU/(hr·ft·°F). ### What input values are accepted? The value must be a non-negative number. ### What conversion factors are used? 1 kcal/(m·h·°C) equals 1.1627778 W/(m·K), and 1 BTU/(hr·ft·°F) equals 1.7307347 W/(m·K). ### Can I choose the displayed precision? Yes. Set decimal places from 0 to 10; the default is 6. ### Does the result include other unit equivalents? Yes. The JSON result includes the selected output and equivalent values in all three supported units. ## Related tools - [Air Changes per Hour (ACH, n = Q/V)](https://elysiatools.com/en/tools/air-changes-per-hour): Compute the air change rate (ACH / n) of a room from the outdoor supply airflow Q and the room volume V: n = Q/V (1/h). Three modes: solve ACH (given Q and V), solve airflow (given n and V), or solve volume (given n and Q). Flow in m³/s/m³/h/CFM, volume in m³/ft³/L. 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