Free HVAC Air Conditioner BTU Cooling Calculator Online
Calculate required BTU cooling capacity and AC tonnage for rooms based on square footage, ceiling height, sunlight exposure, and climate zone. — 100% free online utility, zero sign-up, zero paywalls, and private client-side processing.
How It Works
Enter Room Square Footage
Input room width and length (or total square feet).
Account for Sun Exposure
Select sunny room (+10% BTUs), shaded room (-10%), or kitchen (+4,000 BTUs).
Input Occupants
Add 600 BTUs for each additional occupant over 2 people.
View Recommended BTUs
Get target cooling capacity in BTUs and AC tons (1 Ton = 12,000 BTU/h).
Frequently Asked Questions
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