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BTU Calculator

British Thermanl Unit or BTU for short is a measure of heat output. We believe it is the best way to work out what size radiator or how many radiators you will need in a room. There are many factors to consider when calculating BTU such as room dimensions, room type, windows and orientation. Please feel free to use our BTU calculator below to work out what radiators you will need.

Calculate Your Room's BTU


Which room are you measuring?

Dimension Unit

Which unit are you measuring in?

Room Dimensions

Width *

Length *

Height *

Additional Information

Does your room have any of the folowing?

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Frequently Asked Questions

What is BTU output?
How do I calculate the BTU’s needed for my room?