Energy & Utilities
HVAC BTU Calculator
Lets users plan and optimise hvac btu instantly with formula, steps and examples — no manual math.
Enter your details
sq ft
010
Your result
Cooling capacity needed
4,000 BTU/hr
≈ 4,000 BTU/hr → about a 0.25-ton air conditioner.
Recommended AC size
0.25 ton AC
In tons
0.3333 ton
About this calculator
Air-conditioner sizing: ~20 BTU per square foot, +600 BTU per occupant above two, +10% for sunny or kitchen rooms. 12,000 BTU/hr = 1 ton of cooling.
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