basic

Thermal Resistance from Material Thickness and Area Calculator

R_th = L/(k·A) — K/W resistance to heat flow.

Calculates thermal resistance R_th = L/(k·A), where L is thickness, k is thermal conductivity, and A is cross-sectional area. Also converts to R-value (imperial).

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

m
W/(m·K)
m²

Results

Enter values and click Calculate to see results.
Was this helpful?

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_th = L / (k · A)

In depth

Calculates thermal resistance R_th = L/(k·A), where L is thickness, k is thermal conductivity, and A is cross-sectional area. Also converts to R-value (imperial).