- Measure the length and width of the room and multiply the figures to determine the square feet.
- Multiply the result in step one by 25.
- For each occupant in the room, add 400. For example, in a couple's bedroom, the total would be 800. Add this to your total from above.
- Add 1,000 for each window in the room.
- The total should give you a rough estimate of the amount of BTUs needed to cool the room and keep it at a comfortable temperature.
Radiator BTU Calculator
The efficiency of radiators, old and new, is measured in British Thermal Units (BTU).
The dimensions of a room are used to calculate the amount of BTU needed to heat that room.
Radiators all have a known and calculated BTU output.
Using the BTU outputs it is easy to calculate the size of radiator you need to heat your room.