AC Tonnage Calculator

Right AC size for your room (Pakistani heat).

About this calculator

Pakistani summers push 45°C in many cities, so the right air conditioner size matters more here than anywhere. An undersized AC runs nonstop and never cools, while an oversized one short-cycles, wastes electricity and cools unevenly. This calculator matches tonnage to your room size, sun exposure and floor level.

Getting the tonnage right also protects your electricity bill — a correctly sized inverter AC uses far less power than a struggling unit. Enter your room’s length and width, note the sunlight and top-floor factors, and the tool recommends 1, 1.5 or 2 ton with a clear explanation.

How to use

Measure your room’s length and width in feet and enter them.
Select sun exposure (direct sunlight adds heat load) and whether it’s a top-floor room.
Click Calculate to get the recommended AC tonnage.
Buy that tonnage — preferably an inverter model for lower bills.

Frequently asked questions

What size AC do I need for a 12x12 room?

A 12×12 ft room (144 sq ft) usually needs a 1-ton AC; with direct sun or a top floor, go for 1.5 ton. The calculator adjusts for these factors automatically.

Is a bigger AC always better?

No. Oversized ACs cool too fast, shut off, and restart constantly — raising bills and humidity. Match the tonnage to the room for best efficiency.

Does an inverter AC save electricity?

Yes — inverter ACs adjust compressor speed instead of switching on/off, typically cutting cooling electricity use by 30–50% versus non-inverter models of the same tonnage.