Introducing the Electric Underfloor Heating Calculator: Simplifying Mat and Cable Selection

Choosing the right electric underfloor heating (EUFH) mat or cable size can feel overwhelming, especially when trying to balance room shape, available space, and product options. At The Heating Partnership, we understand the challenges faced by both homeowners and installers. That’s why we’ve created a powerful, easy-to-use Electric Underfloor Heating Calculator to make the process quick, accurate, and hassle-free.

Whether you're planning a new installation or retrofitting an older space, our calculator helps you select the perfect mat or cable size in seconds, ensuring efficient heating coverage and minimal waste. In this article, we’ll explore how it works, why it matters, and how it can transform the way you plan your EUFH installation.

Why Accurate Mat/Cable Sizing Matters

Incorrect mat or cable sizing is one of the most common installation pitfalls. An oversized mat might not fit the room, while an undersized one leaves cold spots. This leads to reduced comfort, energy inefficiency, and costly replacements or adjustments.

Our Solution: The calculator ensures your mat or cable selection is within an optimal coverage range, typically aiming for up to 90% of your available floor space, factoring in the necessary fitting gaps and clearances.

How the Calculator Works

Our tool is designed to be fast, intuitive, and accurate. No technical knowledge is required, just a few simple measurements.

Using the Calculator:

• Step 1: First step is to choose between heating mats or cables. Cables are recommended for irregularly shaped rooms.
• Step 2: Enter your free floor area (m²), or room dimensions (length and width in metres).
• Step 3: The calculator automatically accounts for fitting space and recommends the best mat or combination of mats based on your requirements.
• Step 4: Add any options like insulation, decoupling membrane and thermostat.
• Step 5: View the results and add your selected products directly to your basket ready for checkout.

It’s that simple. No more guesswork. No more wasted time.

Smart Features Built for Installers and Homeowners

We’ve built the calculator to be flexible enough for professionals while remaining accessible to DIY users.

Key Benefits:

• Combination Suggestions: If no single mat or cable fits perfectly, the calculator offers the best combination to maximise floor coverage.
• Thermostat Reminder: Don’t forget to choose a thermostat. Our calculator gives you a handy reminder and allows you to add one from the same screen.
• Dynamic ‘Add to Cart’ Button: The button and total price shown updates to reflect your selections and options, ensuring clarity before checkout. Plus no hidden shipping costs, all deliveries are free.

Planning Ahead for a Perfect Install

While the calculator handles the heavy lifting, we always recommend checking your layout carefully before placing an order.

Pro Tips:

• Always deduct unheated fixed units, islands, and sanitaryware.
• If your space has multiple unheated areas (e.g. an L-shaped kitchen with an island), treat them as separate rectangles, add the areas up and and use the "Unheated area" to deduct the total area.
• Your result will be just under your room size, don’t worry this is by design. A slight undersize ensures safe, efficient heating and avoids overcrowding the floor on installation.

Designed with You in Mind

This calculator is just one more way we’re making electric underfloor heating easier, faster, and more accessible. It saves time during project planning, reduces errors in ordering, and improves installation outcomes, whether you’re fitting one room or managing a full renovation.

If you need help interpreting your results or have a more complex room shape, our team is always happy to help. You can send us a drawing, sketch, or set of dimensions, and we’ll offer personalised support.

Try It Today

Ready to get started? Try our Electric Underfloor Heating Calculator and take the guesswork out of underfloor heating selection.

Still unsure? We’re here to assist. Reach out by phone, email, or our contact form for expert guidance tailored to your project.