Window AC Size & BTU Calculator

Calculate the ideal cooling capacity (BTU & Tonnage) required for your bedroom, living room, or office.

Room Length (ft) 15 ft

10 ft 15 ft 20 ft 25 ft

Room Width (ft) 12 ft

10 ft 12 ft 15 ft 20 ft

Sunlight / Top Floor Factor

Recommended Cooling

1.5 Ton

18,000 BTU/hr

Total Room Area

180 sq ft

Estimated Power

~ 1,400 Watts

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Frequently Asked Questions

Common questions about sizing your air conditioner.

As a general rule, an AC requires about 20 BTU per square foot of room space. For room sizes in India: up to 120 sq ft requires 1 Ton, 120-200 sq ft requires 1.5 Ton, and above 200 sq ft requires 2 Ton.

Yes! If your room gets direct sunlight or is located on the top floor directly under the roof, heat gain increases by 10% to 20%. Selecting a slightly higher tonnage ensures faster cooling and lower power consumption.

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