AC Tonnage Calculator
Find the right AC size for your room before you buy. Enter length, width, ceiling height, sun-facing walls and how many people use the room, and get a recommended tonnage in tons and BTU plus the expected running watts.
How to use
- Enter the room length, width and ceiling height in feet.
- Select top floor, sun-facing walls and the usual number of people.
- The recommended tonnage and approximate inverter / non-inverter watts appear instantly.
Model: Base = Area (sq ft) x 70 BTU (65-80 range for Pakistan's heat). If height is over 10 ft, add +5% for each extra foot. Top floor x1.15. Each sun-facing wall +7%. Each person over 2 adds +500 BTU. 1 Ton = 12,000 BTU. For AC fitting, service or a new AC — Azlaan Electric AC Solar Center, Faisalabad — 0300-8987448.
Related guides: Solar System Size for 1.5 Ton AC, AC Servicing Price Guide Pakistan.
Frequently Asked Questions (FAQ)
How do I know what AC tonnage my room needs?
Enter your room size, ceiling height, sun-facing walls and other details, and the calculator recommends the right size in tons and BTU.
Is it tuned for Pakistan?
Yes, the base model uses 70 BTU per square foot, a range suited to Pakistan heat.
Does it adjust for top floors and sun-facing walls?
Yes. A top floor adds 15 percent, each sun-facing wall adds 7 percent, and extra ceiling height or extra people add more.
What is the difference between tons and BTU?
They are two units for cooling power: 1 ton equals 12,000 BTU. The tool shows both.
Does it show expected running watts?
Yes. Along with tons and BTU, the calculator estimates the expected running watts of the recommended AC.