Radiator sizes in the UK are measured using the metric system, so you will need to ensure you measure in metres (m) or millimetres (mm). When measuring your room, ensure you have the size converted correctly as you will need to input this into the radiator size calculator.
To calculate the British Thermal Unit (BTU) output accurately and effectively for a room, you will need to grab your tape measure. Ultimately you will need to multiply the room length by its width. You should measure:
- Room height
- Room width
- Room length
- Size of the window area (length x width of your window in m²)
The reason for calculating the window dimensions is plain and simple – heat loves to escape. The bigger the window, the more chance of heat escaping. This will also differ depending on whether you have single or double-glazed windows. Single-glazed windows will lose the most heat, so your BTU will need to be higher for these.
To help make this even easier, you can use our BTU calculator to work this out effortlessly.
Once you have the room size, you can then use our calculator to work out the correct size radiator you need.
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