Select whether you want to base your calculation in metres or in feet.

Enter your room dimensions into the boxes.

Click on the "Calculate" button.

The approximate heat output for your room size will be calculated and displayed.

Manual Calculation
(Room Length (m) × Room Width (m) × Room Height (m)) ÷ 12 = Output (kW)

This page does not provide an exact classification for appliance output, but can be used to give you a good idea. The ability of a stove to heat your room can be affected by other factors which you will need to take into consideration such as a larger than usual number of doors or windows (including patios) in the room, or other draft sources. In these cases you may need to look at a stove with a greater output.

Building Regulations state that if you install a stove or fire that has a output rating over 5kW a ventilation brick will need to be installed in your room.