// multi-utility computation suite · offline · instant · precise
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tool.heat-loss-house Calculator
Calculates total heat loss through walls, ceiling, windows, and floor from U-values, area, and design temperature difference, sizing the heating system. Accurate Manual J heat loss calculation prevents oversized systems that short-cycle and leave humidity problems.
Inputs
Floor Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Ceiling Height M
Vertical measurement. For health calculators, typically standing height without shoes.
U Walls
Reference formula or conversion factor shown for context.
Indoor Temp C
Reference formula or conversion factor shown for context.
Results
total heat loss (kW)
The combined total across all inputs and components.