How to Calculate Air Conditioning Tonnage & Wattage
- 1). Take measurements of the area to be cooled. Multiply the length, width and height of the area in foot measurements to arrive at the total area.
- 2). Divide the total area by 1000. The resulting number is your ton capacity.
- 3). Multiply your final tonnage by 3517 watts to find the wattage for your air conditioner.