AC size guide
10x12 Room AC Size
Most 10x12 ft (120 sq ft) rooms need a 1.5 ton AC. A shaded room can use 1 ton.
Size for your type of room
| Room type | Cooling load | AC size |
|---|---|---|
| Shaded room, lower or middle floor | 13,680 BTU/h | 1 ton |
| Normal sun, middle floor | 15,120 BTU/h | 1.5 ton |
| West-facing or top floor | 18,216 BTU/h | 1.5 ton |
Monthly bill for a 1.5 ton AC
At 8 hours a day and ₹6 per unit (Gujarat higher slab). Change the numbers in the calculator below.
| AC type | Units per hour | Per month |
|---|---|---|
| 5-star inverter | 1.05 | ₹1,512 |
| 3-star inverter | 1.27 | ₹1,836 |
| 3-star non-inverter | 1.50 | ₹2,160 |
Check your exact room
The calculator is filled with this room size. Add ceiling height, sun, floor and people for your exact answer.
Pick a typical room, or enter your own below
Live estimate
120 sq ft · approx 1.5 Ton
Calculate for cost & models
Fine-tune: sunlight, floor, ceiling height, occupancy▾
What changes the size
- Afternoon sun on a west wall can add 10 to 15%.
- A top floor under a concrete roof adds about 10%.
- Each extra person adds about 600 BTU/h.
- A ceiling above 10 ft adds about 10% per foot.
- A kitchen or many electronics add 1,000 to 3,400 BTU/h.
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Common questions
›How many ton AC for a 10x12 room?
Most 10x12 ft (120 sq ft) rooms need a 1.5 ton AC. A shaded room can use 1 ton.
›What is the monthly bill for a 1.5 ton AC in this room?
About ₹1,512 a month for a 5-star inverter AC, at 8 hours a day and ₹6 per unit.
›10 by 12 room me kitne ton ka AC lagega?
Normal dhoop aur beech ki manzil par 1.5 ton ka AC. Chhaon wale room me 1 ton kaafi hai.
›Is a bigger AC better?
No. An oversized AC switches on and off often, removes less humidity and wastes power. Buy the right size.