BTU Calculator (Air Conditioning)
Estimate the cooling power (BTU/h) needed for a room from its floor area.
Result
Cooling power (BTU/h)
5,375
Power (kW)
1.58
How it works
BTU/h ≈ area (m²) × 215
A rough rule sizes an air conditioner at about 215 BTU/h per square metre. Sun exposure, ceiling height and occupants can raise the real need.
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Frequently asked questions
How many BTU do I need?
About 215 BTU/h per m² as a baseline — a 25 m² room needs roughly 5,400 BTU/h.
What raises the BTU needed?
Strong sun, high ceilings, many people, kitchens and poor insulation all increase it.
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