radiator calculator | knowledge | B&Q

Radiator BTU calculator

This heat output or 'BTU' (British thermal unit) calculator is a great way to work out how much radiator power you need.

Tell us a bit about where you want to heat and what kind of radiator you want and we can recommend the best suited radiators for you.

Your room

metres   metres   metres
French windows   Double glazing   North facing  


BTU per hour 0 per radiator