Radiator / BTU Calculator

This application is a must for any plumber, builder or home DIY enthusiast, infact anyone who wants to find out what radiator BTU's are required for a particular room size.

Wether you have existing radiators and want to check that they are the correct size or if you are adding a new radiator to a room; this is the application for you.

The simple yet intuitive interface allows you the choice of measurements in feet or meters.

This calculator has the added benefit of showing you the BTU required and also the kW required - all of which can be stored in the application database so you can refer to them at a later date. No more scraps of paper left lying around.

Features that can be adjusted for the BTU calculation include:

Room volume
Room use
Double glazing
North facing
French windows
Flooring
Foam-filled or uninsulated cavity walls
2 or 3 outside walls
Units of measurement
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We have also included a free Celsius to Fahrenheit converter and a gross / net kW/BTU converter. Show More