Heat Loss Calculator
Calculate heat loss 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 or HVAC result estimates heating, cooling, airflow, heat transfer, or efficiency from the dimensions, temperatures, rates, and equipment values entered. Check design conditions, insulation, occupancy, ventilation requirements, equipment efficiency, and the units used.
When to use it
Use this for preliminary building comfort or equipment planning. Confirm actual site conditions, manufacturer data, and applicable mechanical/building codes before sizing or installing HVAC equipment.