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Home, building & household

Air conditioner capacity calculator

Estimate cooling capacity from room volume and a capacity factor.

Your result

Complete the fields and calculate.

Calculation method and formula

Room area [m²] × Ceiling height [m] × Capacity factor [W/m³] ÷ 1000

Understand the inputs

Room area
Unit: m². Use a measured value or your own assumption.
Ceiling height
Unit: m. Use a measured value or your own assumption.
Capacity factor
Unit: W/m³. Use a measured value or your own assumption.

Assumptions and limitations

Entered consumption or sizing factors are approximations. Insulation, weather, efficiency and usage are not fully modeled; this does not replace technical system sizing.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Room area
35 m²
Ceiling height
2.6 m
Capacity factor
45 W/m³
Example result4.1 kW

That is about 13,972 BTU/h. Sun exposure and insulation change the requirement.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Air conditioner capacity calculator work?+

Room area [m²] × Ceiling height [m] × Capacity factor [W/m³] ÷ 1000. Entered consumption or sizing factors are approximations. Insulation, weather, efficiency and usage are not fully modeled; this does not replace technical system sizing.

What assumptions should I consider for this result?+

Entered consumption or sizing factors are approximations. Insulation, weather, efficiency and usage are not fully modeled; this does not replace technical system sizing. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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