BTU Calculator (AC)
Estimate the cooling BTU needed for a room.
Result
Results are estimates for general information only and are not professional advice.
Sizing an air conditioner
A common rule of thumb is about 20 BTU of cooling per square foot of room area. This calculator estimates the BTU rating you need; adjust upward for sunny rooms, high ceilings or many occupants.
Frequently Asked Questions
What is the BTU Calculator (AC)?
Estimate the cooling BTU needed for a room. It runs instantly in your browser and is completely free.
Is the BTU Calculator (AC) free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the BTU Calculator (AC)?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.