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AC BTU Calculator

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AC BTU Calculator

Rough cooling BTU from room size (≈20 BTU/ft²).

Length (ft)

Width (ft)

Sun factor (1=normal)

BTU/hr

How it works

Rule-of-thumb sizing from floor area.

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.

\[ BTU \approx 20\cdot A \]

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