Buying an air conditioner is a big decision — and getting the size wrong is the most expensive mistake you can make. An undersized AC runs non-stop and still leaves you hot. An oversized AC cools too fast, leaves the room clammy, and wastes electricity through short cycling.

Our AC tonnage calculator removes the guesswork. Instead of relying on a salesperson's rough estimate, you get a precise cooling load calculation based on your room's actual conditions — size, sunlight, insulation, occupancy, and appliances.

In air conditioning, "tonnage" doesn't mean weight. One ton of cooling equals 12,000 BTU per hour — the heat needed to melt one ton of ice in 24 hours. So a 1.5-ton AC delivers 18,000 BTU/hr of cooling.

Why does it matter? Because your room AC capacity must match your actual cooling load. Too little, and you never feel comfortable. Too much, and you pay for energy you don't need while humidity stays high.

Our BTU calculator starts with your room's base area and applies real-world adjustment factors:

• Room size or type: Enter exact dimensions or pick a preset like "Medium Bedroom."
• Sunlight exposure: Heavy sun can add up to 10% more cooling load.
• Insulation quality: Poor insulation can increase tonnage by 15–20%.
• Ceiling height: Higher ceilings mean more air volume to cool.
• Windows: More glass means more heat gain from outside.
• Occupancy: Each person beyond two adds roughly 600 BTU.
• Appliances: Computers, TVs, and ovens all add heat.

The result is a precise cooling load recommendation in both tons and BTU — ready to take to any store or installer.

Once you have your recommended tonnage, shopping gets much easier. Here's a quick cheat sheet for common residential sizes:

• 1 ton (12,000 BTU): Small bedrooms up to ~120 sq ft.
• 1.5 tons (18,000 BTU): Medium bedrooms and living rooms up to ~180–220 sq ft.
• 2 tons (24,000 BTU): Large master bedrooms and open living areas up to ~350 sq ft.
• 2.5–3 tons (30,000–36,000 BTU): Open-plan spaces and homes in very hot climates.

Still unsure? The team at 0Degrees Airconditions can help you match the perfect model to your space. For more buying tips, visit our Location.

Correct sizing is the foundation of energy efficiency. An AC that matches your room's cooling load runs in longer, gentler cycles — maintaining consistent temperature and using less electricity overall.

Over a typical Indian summer, the savings from a properly sized unit can be substantial. Combine the right tonnage with an inverter compressor and a high star rating, and your monthly bill drops dramatically.

Use the calculator above to get your personalised recommendation in seconds. Whether you're buying your first air conditioner or upgrading an old one, accurate sizing is the key to comfort, efficiency, and long-term savings.

For expert guidance and premium air conditioning solutions, trust 0Degrees Airconditions — where comfort meets efficiency.