Construction

AC Tonnage Calculator

Estimate air conditioner size for a room.

Calculated Output

Cooling needed (BTU/h) 12,000

AC size (tons) 1

Formula: BTU = area × BTU/ft² ; tons = BTU ÷ 12000

Step-by-Step Breakdown

1. Values used:

2. Room area = 600

3. BTU per ft² = 20

5. Cooling needed = Room area x BTU per ft² = 600 x 20 = 12,000BTU/h

6. AC size = 1tons

Did this calculator solve your problem today?

The math behind it

BTU/h = area × ~20 BTU/ft²; 1 ton of cooling = 12,000 BTU/h.

600 ft² → 12,000 BTU (1 ton).

Adjust for?

Sun exposure, ceiling height, climate and occupancy.