To estimate your AC tonnage needs, multiply the number of square feet you're cooling times 25. This equals the total number of BTUs you need to adequately cool your space. Next, divide that number by 12,000 to determine the tonnage capability you need in your new air conditioning unit.

How AC tonnage is calculated?

Area Method : To calculate, multiply the length and breadth of the room (in feet), take square-root of the answer and divide by 10. ... Volume Method : Alternatively, multiply the length, breadth and height of a room (in feet). Divide the answer by 1000. This is the tonnage required.

What is the formula to calculate tonnage?

tonnage, in shipping, the total number of tons registered or carried or the total carrying capacity. Gross tonnage is calculated from the formula GT = K₁V, where V is the volume of a ship's enclosed spaces in cubic metres and K₁ is a constant calculated by K₁ = 0.2 + 0.02 log₁₀ V.