Underfloor heating calculation: pipes, circuits, power (Excel)

Underfloor heating calculation: pipes, circuits, power (Excel)

How much tubing is needed for radiant underfloor heating? How many circuits will there be? Calculate in 2 minutes.

Are you a professional or a DIY enthusiast? You know that installing radiant underfloor heating requires calculating the tubing length, number of circuits, thermal power output, and volumetric water flow. Manual calculations are time-consuming and prone to errors. And mistakes cost money: if you buy too little tubing, you’ll have to make an additional purchase; if you buy too much, you’ll overpay.

This calculator solves the problem. Enter the data and get a ready-made answer: how much tubing, how many circuits, what the power output is, and what the water flow rate should be.

What it calculates:

Tubing length – considering installation spacing and usable floor area.
Number of circuits – based on the rule “no more than 80 meters per circuit.”
Thermal power output – 100 W/m² (a standard for comfortable floor heating).
Volumetric water flow – the volume pumped through each circuit (accounting for temperature difference).
Reference data – recommended installation spacing for different floor coverings.

Why it’s convenient:

Accounts for furniture – floors under cabinets and sofas don’t receive heating.
Calculates circuits – to ensure the pump can push water effectively.
Simple. Enter data and get results.
Secure. Formulas are hidden; buyers can’t tamper with them.

Who it’s suitable for:

Plumbers and professional installers – for calculating radiant underfloor heating systems.
DIY enthusiasts – for personal use.
Anyone doing renovations.

Important: Calculations are based on area. For apartments, electric heating systems are typically used. Check the available power budget.

Format: Archive (Excel + Word). Compatible with Microsoft Excel and Google Sheets.