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Cooling BTU by Room Size

Room AC BTU from length, width, and ceiling height.

Inputs

Inputs and assumptions

Room length in feet (1 ft = 0.305 m).

Room width in feet (1 ft = 0.305 m).

Taller ceilings need more cooling.

20 average room, 25 sunny kitchen.

Result

Room area (sq ft)
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Cooling needed (BTU/hr)
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What to check

  • Room dimensions
  • Sun exposure and kitchen heat

Related calculators

Rule-of-thumb screening estimate, not an ACCA Manual J calculation. Confirm with a room-by-room Manual J load calculation and installer quotes before buying equipment.

Saved calculations

Keep the assumptions with the result.

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