Heat Gain Calculator
Calculate heat gain through a building component using U-value, area and temperature difference.
How to use this calculator
What to enter
Enter or select the following as requested: U-value (W/m²·K); Area (m²); Temperature difference (K). Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The thermal result estimates heat transfer from the material’s thermal property, area, thickness or U-value, and temperature difference. Confirm that the entered units are compatible and that the model matches the construction layers and steady-state conditions being considered.
When to use it
Use this for an initial heat-transfer or insulation estimate. Building loads and thermal performance depend on air leakage, solar gain, moisture, thermal bridges, and other factors not represented in a simple calculation.