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

What room do you want to heat: *

What are the dimensions of the room:

Length (metres) *

Breadth (metres) *

Height (metres) *

What is the TOTAL window area (m²) *

How many walls are outside walls: *

What level is the room on:
(for middle floor rooms, select single storey) *

About Your Property

What is the main type of outside wall: *

'U' Value *

How much roof insulation do you have: *

'U' Value *

What type of windows do you have: *

'U' Value *

What is the floor construction: *

'U' Value *

Temperatures

Average external temperature when heating; we recommend -3 for England and Wales and -5 for Scotland: *

Room temperature; This is the average room temperature for the room you selected - feel free to amend if you require a different temperature. *

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