Thermal Resistance Calculator

Calculate R-values, heat flow, and insulation performance for single and multi-layer assemblies.

Enter Material Properties

Select mode and fill in values

Circuit Mode
Material
Thickness (L)
mm
Thermal Conductivity (k)
W/(m·K)
Area (A)
m²
Temperature Difference (ΔT)
°C
Series layers share the same area. Heat flows through each layer sequentially.
Area (A) — same for all layers
m²
Temperature Difference (ΔT)
°C
Parallel paths have different areas. Heat flows through each path simultaneously.
Temperature Difference (ΔT)
°C
R-Value
Heat Flow (Q)
Q (BTU/hr)
R-Value (Imperial)

Enter material properties above and tap Calculate R-Value to see results.

Calculation Steps