Radiant Floor Heating Calculator
Estimate radiant-floor heat output, tubing length, loop count and material cost from heated area, coverage percentage, tubing spacing, routing allowance and maximum loop length.
Default project preview
6 loops
Heated floor area
1,080 ft²
Planning heat output
27,000 BTU/h
Tubing before allowance
1,440 ft
Average tubing per loop
264 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Base tubing length ≈ heated area ÷ tubing spacing. Routing allowance is added, then total tubing is divided by maximum loop length and rounded up. Heat output = heated area × entered output rate.
FAQ
Radiant Floor Heating Calculator questions
Why exclude some floor area?+
Permanent cabinets, tubs and other areas may not receive tubing, depending on the system design.
Does shorter spacing increase tubing length?+
Yes. Closer spacing places more tubing in the same floor area.
Does this size the boiler or heat pump?+
No. Equipment sizing requires a room-by-room heat-loss calculation and system design.