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Thermal Wall Resistance & U-Value Calculator

U = 1/R_total — wall thermal transmittance from layers.

Calculates thermal resistance (R-value) and U-value of a multi-layer wall construction from layer thicknesses and conductivities.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

R = d/λ; R_total = R1+R2+R3; U = 1/R_total

In depth

Calculates thermal resistance (R-value) and U-value of a multi-layer wall construction from layer thicknesses and conductivities.