Heat Loss Calculator - Size Heating Systems & Compare Insulation

Calculate your building's heat loss in watts to size heating systems correctly and evaluate insulation upgrades. Free tool uses U-value, surface area, and temperature difference.

Heat Loss Calculator

Room Dimensions

m
m
m

Insulation Level

The insulation level affects how quickly heat escapes from your room. Better insulation means lower heat loss.

Temperature Settings

°C
°C

Room Visualization

Heat Loss Formula:
Heat Loss = U-value Ă— Surface Area Ă— Temperature Difference
= 1.0 W/m²K × 85 m² × ΔT°C

Heat Loss Results

Total Surface Area
0.0 m²
U-Value (Thermal Transmittance)
1.00 W/m²K
Temperature Difference
21.0 °C
Total Heat Loss
0 W
Copy Result
Moderate Heat Loss

Your room has good thermal performance. Standard heating will be sufficient for comfort.

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Documentation

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