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BTU Calculator
Choosing radiators shouldn’t feel like guesswork. If you’re not sure what heat output your room needs, our BTU calculator is a quick, easy way to get a solid starting point and move one step closer to the right radiators for your home.
Simply pick the room you’re heating, enter your approximate measurements and we’ll estimate the BTU requirement (the heat output) to help you plan a space that feels warm and comfortable..
A quick note: Our BTU calculator assumes your home has double-glazed windows (not single-glazed). The BTU figure you receive is an estimate, rather than a fixed specification.
For the most accurate recommendation, we always suggest speaking to a qualified heating engineer, as they can factor in the details a calculator can’t, such as insulation levels, external walls, ceiling height, window and door sizes and overall heat loss.