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Heat Transfer Rate (Conduction and Convection) Calculator

Q = (T_hot − T_cold) / R_total — combined heat transfer.

Calculates total heat transfer rate Q = ΔT / R_total through a wall with a conduction resistance R_cond = L/(kA) and two convection resistances R_conv = 1/(hA).

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

°C
°C
W/(m²·K)
W/(m²·K)
m
W/(m·K)
m²

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

Q = ΔT / (R_conv1 + R_cond + R_conv2)

In depth

Calculates total heat transfer rate Q = ΔT / R_total through a wall with a conduction resistance R_cond = L/(kA) and two convection resistances R_conv = 1/(hA).