BTU CALCULATOR

Sizing a radiator for a room is not as easy as just putting in what was already there, radiators are now more efficient than they were in past years.

As such, rooms need to be re-calculated so that you are not over heating a room with a radiator of too much output and therefore using more energy than is required; or under heating a room with a radiator with insufficient output, may never raise the temperature to that required!

Using the calculator below, you will be able to accurately size your radiators and then find the ideal size for you room.

Island Bathrooms cannot be held responsible nor accountable from the use of this feature. The BTU calculator is provided as a courtesy only!

Room Details

Name of Room :
Type of Room :
What is below the Room? :
What is above the Room? :
Type of Outside Walls :
Type of Windows :
Number of Outside Walls :
Height of Room (m) :
Width of Room (m) :
Length of Room (m) :
Window Area (m²) :

Watts Required :
BTU's Required :

House Summary

(Below you will see the outputs you will require!)