Determine the right air conditioner size for your home based on square footage, climate zone, and home characteristics. An accurately sized AC system provides optimal comfort, humidity control, and energy efficiency.
Enter Your Measurements
Results
AC Size Needed
5.0
tons
Total Cooling Load
60,000
BTU/hr
Exact Tonnage
5.00
tons
Annual Savings (SEER 20 vs 14)
1,286
watts
Formula
How to Use This Calculator
How to Use
- 1
Enter the total cooled square footage of your home.
- 2
Select your climate zone based on your region's typical summer temperatures.
- 3
Enter the number of stories.
- 4
Rate your home's insulation level.
Frequently Asked Questions
Frequently Asked Questions
What size AC for a 2000 sq ft house?
Is it better to oversize or undersize an AC?
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About This Calculator
This calculator uses the formula: Total BTU = Square Footage × BTU per Sq Ft × Insulation Factor × Story Factor | Tons = BTU ÷ 12,000. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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