CalculatorHome & Energy

Air Conditioner BTU Calculator

Estimate a basic cooling capacity from floor area using a simple 20 BTU per square foot rule of thumb.

Instant · no account

Input

Enter your values

Room lengthft

Room widthft

Method

How it works

Change any input above and the result updates instantly. The formula or method used by this tool is shown below.

Estimated capacity ≈ Floor area × 20 BTU/hour

Note

Cooling capacity is a rough sizing estimate. Climate, insulation, sun exposure, ceiling height and occupancy can materially change requirements.

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Quick answers

About this tool

What does the Air Conditioner BTU Calculator do?+

Estimate a basic cooling capacity from floor area using a simple 20 BTU per square foot rule of thumb.

How does this calculator calculate the result?+

It uses this method: Estimated capacity ≈ Floor area × 20 BTU/hour

Are my inputs saved or sent to an account?+

Core CalcForge tools require no account, and most calculations run locally in your browser. Favorites and recent-tool history, when used, stay in this browser.