How does the Heat Loss Calculator work?

Conductive loss: Q = U × A × ΔT (sum all surfaces) Then: Infiltration loss: Q = 1.08 × CFM × ΔT × air density Then: Total loss drives heating system size.

Can you give an example of how to use the Heat Loss Calculator?

Example: Input House 200 m², U-avg 0.5, ΔT 20K, 500 CFM infiltration gives a result of Total loss ~12 kW (heating system needed) (Detailed calc required).

Is the Heat Loss Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Heat Loss Calculator?

Our Heat Loss Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Heat Loss Calculator

U-Value (W/m²K)

Area (m²)

Temperature Difference (K)

Heat loss calculation determines heating requirements based on insulation, air leakage, and temperature difference. Critical for system sizing.

Symbol	Name	Unit	Description
Q	1	—	1
U	U value	—	Variable used in the calculation
A	A value	—	Variable used in the calculation

Difficulty:intermediate

References

›Heat Loss — Wikipedia

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Heat Loss Calculator