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BTU Calculator
Enter the room size to find the cooling capacity you need.
BTU Calculator
Cooling capacity needed0.5 tons · 1.76 kW
ENERGY STAR room-AC sizing: ~20 BTU per ft² for 8 ft ceilings, adjusted for sun, occupants and kitchens. Whole-house systems need a Manual J load calculation.
Planning estimates only. Building codes, loads and material specs vary — have a licensed engineer or contractor confirm quantities and safety requirements. Disclaimer
Frequently asked questions
Is my data uploaded?
No. The calculation runs entirely in your browser — nothing you type is sent to a server.
Is it free?
Yes — free, unlimited and no sign-up.