1. Measure the area of the room and convert that figure into BTU's. The area of the room is determined by multiplying the length and width. The measurement must be in meters, (1 foot
http://www.ehow.com/how_4965390_calculatehvacton...

Tonnage of a ship is not necessarily the number of tons that the ship weighs. There are at least six different methods of rating ships; the most common are: Displacement tonnageused
http://www.answers.com/topic/howisashipstonna...

You can't. Seer is the efficiency rating. Try the amperage and voltage formular.
http://wiki.answers.com/Q/How_do_I_Convert_hvac_se...

There is a regular FORMULA for computing tonnage. you won't find it here on Answers but you can try looking in BOWDITCH or do you mean Tonnage in AIR CONDITIONING? This is BOATS AND
http://answers.yahoo.com/question/index?qid=201201...
