BTU and Tonnage Rough Sizing Calculator
Get a ballpark cooling size from floor area. Good for a quick sanity check, not for picking equipment.
Estimate only. Real sizing needs a proper load calculation (like ACCA Manual J for homes). Insulation, windows, people, and climate change the answer a lot.
Result
Fill in your numbers and hit Calculate.
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How the math works
BTU per hour = area (sq ft) x BTU per sq ft
Tons = BTU per hour / 12,000
kW = BTU per hour / 3,412.14Free weekly email
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