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AC BTU Calculator
Rough cooling BTU from room size (≈20 BTU/ft²).
Free to use — no sign-up or login.
BTU/hr
Amortization schedule
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This free AC BTU Calculator covers Rough cooling BTU from room size (≈20 BTU/ft²).
Rule-of-thumb sizing from floor area. Related home tools sit beside How it works, with no account required.
Using the AC BTU Calculator
Rough cooling BTU from room size (≈20 BTU/ft²). Typical inputs are Length (ft), Width (ft) and Sun factor (1=normal). How it works beside the form states the identity the AC BTU Calculator applies.
FAQ
How do I use the AC BTU Calculator?
Open the AC BTU Calculator, fill Length (ft), Width (ft) and Sun factor (1=normal), and read the result. Enter Length (ft), Width (ft), and Sun factor (1=normal) for the AC BTU Calculator; retain the units printed in each label. The calculator reports BTU/hr: Rule-of-thumb sizing from floor area. This area rule does not replace a load calculation that includes insulation, climate, occupancy, and windows.
What formula does the AC BTU Calculator use?
The AC BTU Calculator uses the identity in How it works. In words: Enter Length (ft), Width (ft), and Sun factor (1=normal) for the AC BTU Calculator; retain the units printed in each label. The calculator reports BTU/hr: Rule-of-thumb sizing from floor area. This area rule does not replace a load calculation that includes insulation, climate, occupancy, and windows.