BTU CALCULATOR

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.

Our BTU (British Thermal Units) calculator will help you to work out the heat requirement for your room, and recommend the number of radiators you will need to comfortably heat it.

What is a BTU?

​​Our BTU (British Thermal Units) calculator will help you to work out the heat requirement for your room, and recommend the number of radiators you will need to comfortably heat it.

How do I choose the right radiator?

The BTU value of all our radiators is clearly in our webstore helping you find those which suit your requirements.

Calculate BTU Rating of Each Room
Room in Cubic Meters

Please Tick the Room you wish to calculate BTU

Please Click where you require your radiator(s)

Windows Installed *

Please Click which windows are installed

The Below Field will give you your BTU Requirement

Please Refer to the BTU Rating when searching for you new radiator(s)

Calculated BTU Value
Calculated Watts Value