Find Your Perfect AC Size in Seconds
Answer a few quick questions — get an accurate AC tonnage recommendation instantly
Room & Cooling Details
Fill in your room details below to calculate the ideal AC tonnage.
Best fit for your room
Why this size?
This is a quick estimate based on standard HVAC sizing rules of thumb. For homes with poor insulation, large glass windows, or unusual layouts, get an on-site load calculation from a technician.
How This AC Tonnage Calculator Works
AC tonnage tells you how much heat an air conditioner can remove per hour. One ton of cooling equals 12,000 BTU/hr. A common HVAC rule of thumb is roughly 100–120 BTU per square foot of room area, adjusted upward for high ceilings, strong sunlight, hot climates like the UAE and Gulf region, and extra occupants. This calculator applies those adjustments automatically to recommend the nearest standard AC size (1, 1.5, 2, 2.5, 3, 4, or 5 ton).
For a deeper technical reference on how professionals size cooling equipment, see the U.S. Department of Energy's guide to central air conditioning. In Gulf countries like the UAE, actual field practice often runs slightly higher than U.S. rule-of-thumb numbers because of longer, more intense summer heat loads — which is why this calculator applies an extra hot-climate adjustment on top of the base BTU-per-square-foot figure.
Table of Contents
Frequently Asked Questions
How many square feet does a 1 ton AC cool?
A 1 ton AC (12,000 BTU/hr) typically cools around 100–120 sq ft under normal conditions. In hot climates like the UAE, or rooms with high sunlight exposure, the safe coverage is closer to 90–100 sq ft.
How do I calculate AC tonnage for my room?
Multiply your room's square footage by 100–120 BTU, then adjust for ceiling height, sunlight, climate, and occupants. Divide the result by 12,000 to get tons. Use the AC Tonnage Calculator above to do this instantly with your exact room details.
What happens if I install an oversized or undersized AC?
An oversized AC cools too fast without removing enough humidity, leaving the room feeling clammy, and it short-cycles, which wears out the compressor faster. An undersized AC runs constantly and still fails to reach the set temperature during peak heat. Getting the tonnage right avoids both problems.
Is this calculator accurate enough to buy an AC unit?
This AC Tonnage Calculator gives a reliable estimate based on standard HVAC sizing rules of thumb, suitable for most homes and offices. For large spaces, poor insulation, unusual layouts, or commercial installations, get an on-site Manual J load calculation from a licensed HVAC technician before purchasing.
More Free HVAC Tools
- HVAC Unit Converter — BTU, Ton, kW, PSI, CFM & more
- Electricity Cost Calculator — estimate your AC's monthly running cost
- Superheat & Subcooling Calculator — for refrigerant charging checks
- Motor, Belt, Pulley & Bearing Calculator
- About Learn HVAC Pro — 10 years of real Gulf-region HVAC field experience