BTU Calculator

Choosing the right size radiator can be a daunting prospect, but we’re here to help. Our BTU Calculator can help you calculate the BTU (British Thermal Units) energy requirement of your room and suggest the best options for the output you’re looking for.

Fill out the information below and it will show you which radiators work best for your heating needs.

Already know your BTU?

Please use the following form to calculate the BTU (energy) requirement of your room. We'll then show you a selection of products that match your requirement.*

Room Details




For larger rooms, consider splitting your heat output into multiple radiators to avoid cold spots in a room.

* Please note that all calculations are approximate; for more accurate results a heating engineer should be consulted.
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