Room Heating Calculator

For an estimate of how much heat you need for a room, please use the guide below.

Please note the calculations returned should be taken as a guide only and are not detailed heat loss calculations.

  • This guide can be used for multiple rooms, but it treats each room individually and assumes adjacent rooms are unheated
  • If your room/property does not fit the description provided, or you would like a more detailed assessment please visit our heating design section
  • Items with * are compulsory
for middle floor rooms, select single storey
We recommend -3 for England and Wales and -5 for Scotland:
This is the average room temperature for the room you selected - feel free to amend if you require a different temperature.