Heat Conduction Rate Calculator
Estimate heat flow through a single uniform layer under a stated temperature difference. The tool shows the method and key assumptions so you can inspect how the input values lead to the estimate.
How to use this calculator
- Enter thermal conductivity k (w/m·k) using the unit and definition shown beside the input.
- Enter area normal to heat flow (m²) using the unit and definition shown beside the input.
- Enter temperature difference across layer (k) using the unit and definition shown beside the input.
- Check that all values refer to the same time period and scenario.
- Review the outputs alongside the assumptions before using them in a decision.
Formula and assumptions
Steady one-dimensional conduction: Q̇=kAΔT/L; energy estimate (kWh)=Q̇×hours/1000.
- Assumes constant properties, steady-state one-dimensional conduction and no parallel thermal bridges or surface resistances. It is not a complete building-energy model.
- The estimate is calculated from values you enter. It does not connect to external accounts, obtain live prices, or validate local regulations or engineering specifications.
Worked examples
Worked example
With k=0.8 W/m·K, area 12 m², ΔT 15 K and thickness 0.12 m, the estimated heat rate is 1,200 W.
Enter the layer conductivity, area, temperature difference, thickness and duration.
Real assemblies may have thermal bridges, convection, radiation and changing conditions.
Understanding the result
Assumes constant properties, steady-state one-dimensional conduction and no parallel thermal bridges or surface resistances. It is not a complete building-energy model.
Change one input at a time to see how sensitive the output is to that assumption.
Important notes
Assumes constant properties, steady-state one-dimensional conduction and no parallel thermal bridges or surface resistances. It is not a complete building-energy model.
Frequently asked questions
What formula does the Heat Conduction Rate Calculator use?
Steady one-dimensional conduction: Q̇=kAΔT/L; energy estimate (kWh)=Q̇×hours/1000.
What should I verify before relying on the result?
Assumes constant properties, steady-state one-dimensional conduction and no parallel thermal bridges or surface resistances. It is not a complete building-energy model.
Can I compare different scenarios?
Yes. Change one assumption at a time, keep units and definitions consistent, and save the inputs used for each comparison.
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Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.