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Layered Thermal Resistance Calculator
Compute total one-dimensional thermal resistance,U-value and steady heat flow for a layer stack.
Rows [name,thickness mm,conductivity W/(m*K)], Interior surface resistance (m²*K/W), Exterior surface resistance (m²*K/W), Wall area (m²), Inside minus outside temperature (K)
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values using the displayed units and explicit assumptions.
- Choose Calculate result and review the complete report and any undefined or no-solution states.
- Choose Download result to save the complete JSON. Reset clears the result and restores example controls.
Examples
Rows [name,thickness mm,conductivity W/(m*K)]: [["Brick",100,0.8],["Insulation",100,0.04]]
Interior surface resistance (m²*K/W): 0.13
Exterior surface resistance (m²*K/W): 0.04
Wall area (m²): 20
Inside minus outside temperature (K): 20
Limitations
- 1–100 JSON rows [name,thickness mm,conductivity W/(m*K)],positive thickness/conductivity. Nonnegative entered interior/exterior surface resistances m²*K/W,positive area m²,signed temperature difference K. Sum series layer resistances only. No thermal bridges,moisture,air leakage,certification or material-property lookup.
- Scalar controls accept explicit finite decimal syntax;positive values normally1e-12–1e12,nonnegative0–1e12 unless a narrower range is stated. JSON numeric rows use finite IEEE754 values within their stated bounds. Derived counts above1billion and nonfinite results refuse. Combined input<=400000UTF8 bytes;complete JSON<=4MiB. All processing stays in your browser.
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