Free tools

Heating calculators

Free, no registration. Each calculator says whether it calculates exactly or gives an estimate.

Underfloor loop calculator

Room dimensions, pipe spacing and the distance to the manifold. See the loop drawn, the pipe length including the run to the manifold, and how many circuits you need.

width and length
pipe spacing
distance to the manifold

Real geometry · Rectangular room

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Heat loss calculator

Enter heated area, building type, insulation standard and climate zone. Get the estimated building heat demand in kW with a ±10% uncertainty band.

heated area
building type
insulation standard
climate zone

Result in seconds · No registration

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Heat pump sizing calculator

The same 4 building inputs - the result is a recommended heat-pump power range in kW. Preliminary sizing, not a substitute for a design project.

heated area
building type
insulation standard
climate zone

Result in seconds · No registration

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Need the full calculation, not just an estimate

The HeatAlgo app calculates per EN 12831-1, layer by layer. Create a free account - free forever, no card.

Create a free account