How long a loop do I need for underfloor heating?

Roughly the area divided by the c/c spacing: 20 m² at c/c 200 mm gives about 100 metres of pipe. Add pipe for supply and return.

How long can a loop be?

Often a max of about 100–120 metres per loop depending on pipe dimension. Enter the max loop length and the number of loops is calculated.

Which c/c spacing should I use?

Common is 150–300 mm depending on the room and heat demand. Closer c/c means more pipe but more even heat.

Does it cost anything?

No, the calculator is free and requires no account.

Free calculator

Underfloor heating

Laying underfloor heating and wondering how much pipe it takes? Enter the area and c/c spacing to get the loop length and number of loops straight away – a quick basis for ordering material and quoting the job.

Underfloor heating – loop length and number of loops

Enter the area and the pipe spacing (c/c) and we work out the approximate loop length and number of loops. Add supply/return separately.

Area (m²)Pipe spacing c/c (mm)Max loop length (m)

Approx. loop length0 m

Number of loops0 pcs

An estimate (loop length ≈ area ÷ c/c). Allow extra pipe for supply and return to the manifold, and stay within the max loop length per loop.

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This tool gives an estimate and is an aid – not a finished calculation. Always check the result against drawings, applicable regulations, supplier data and your professional experience before giving a binding price, ordering material or using the file. ByggExp is not responsible for decisions made solely on the basis of the tool.

Want help taking this further?

Briefly describe what you need and we’ll help you with a quote, material and next steps – free of charge. Only the contact field is required.

Preview of underfloor heating — This is how underfloor heating looks

How to work out underfloor heating

Work out the area in m².
Enter the c/c spacing between the pipes.
Enter the max loop length per loop.
See the approximate loop length and number of loops.

Don’t forget supply and return

The loop length above is for the floor area itself. Allow extra pipe to and from the manifold, and stay within the max length per loop for even flow.

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Frequently asked questions

How long a loop do I need for underfloor heating?: Roughly the area divided by the c/c spacing: 20 m² at c/c 200 mm gives about 100 metres of pipe. Add pipe for supply and return.
How long can a loop be?: Often a max of about 100–120 metres per loop depending on pipe dimension. Enter the max loop length and the number of loops is calculated.
Which c/c spacing should I use?: Common is 150–300 mm depending on the room and heat demand. Closer c/c means more pipe but more even heat.
Does it cost anything?: No, the calculator is free and requires no account.