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• Calculate the square footage of your room
• Multiply the length x width x height
• Don't forget to measure in metres!

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• Use a BTU calculator for precise measurements
• General guideline: 20 BTUs per square foot
• For our 20 square metre room example:
20 sq m ≈ 215 sq ft
215 x 20 = 4,300 BTUs needed

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Radiator BTU calculator
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The heat output or 'BTU' (British Thermal Unit) calculator is a great way to work out how much radiator power you need. There are several factors which can affect this, such as room dimensions, heating levels and types of window, which are all covered in our radiator BTU calculator. Please note: You may need several radiators for bigger rooms.

How do I choose the right radiator?

The BTU value of all our radiators is clearly labelled in-store and online, helping you find those which suit your requirements.

Which room you are heating?
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Calculators | Radiator BTU calculator | DIY at B&Q

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Radiator BTU calculator Right chevron The heat output or 'BTU' (British Thermal Unit) calculator is a great way to work out how much radiator power you need. There are several factors which can affect this, such as room dimensions, heating levels and types of window, which are all covered in our radiator BTU calculator.

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• Assess insulation quality
• Note window size and type
• Consider ceiling height
• Poorly insulated or rooms with large windows may need more BTUs
• High ceilings might require additional heating capacity

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• Panel radiators: Slim and efficient
• Column radiators: Traditional look, good heat output
• Designer radiators: Stylish, varied heat outputs
• Consider which style suits your room's decor and heating needs

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Single panel radiators are compact and efficient, making them ideal for smaller spaces while still providing effective heating.

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Double radiators feature two panels for increased heat output, making them ideal for larger rooms.

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Column radiators combine classic design with efficient heating, offering a higher heat output and a stylish aesthetic that suits both traditional and modern interiors.

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Designer radiators add a unique artistic touch to a space while providing effective heating.

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Towel radiators combine functionality and style, providing efficient heating while also serving as a convenient space for drying and warming towels in bathrooms or kitchens.

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• Steel: Quick to heat up, affordable
• Cast iron: Slow to heat, but retains heat well
• Aluminum: Lightweight, quick to respond
• Choose based on your heating preferences and budget

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• Look for the BTU rating of the radiator
• Ensure it meets or slightly exceeds your calculated needs
• Check the dimensions to ensure it fits in your space
• Remember: It's better to slightly oversize than undersize

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• Radiators work best under windows or on cold walls
• Ensure furniture doesn't block heat circulation
• Consider the room's layout and usage when deciding placement

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• Consult a heating engineer for complex rooms or systems
• They can provide tailored advice and ensure compliance with regulations
• Professional installation is recommended for safety and efficiency

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• Consider thermostatic radiator valves for individual room control
• Bleed radiators regularly to maintain efficiency
• Use radiator reflectors behind units on external walls
• These small steps can significantly improve heating performance and reduce energy bills