Air Conditioner BTU Calculator
Estimate cooling capacity needed for a room.
Consult HVAC professionals for precise sizing.
Examples
- Area 250 sq ft, BTU 20 ⇒ 5000 BTU
- Area 400 sq ft, BTU 25 ⇒ 10000 BTU
FAQ
What is BTU?
British Thermal Unit, a measure of cooling power.
Is 20 BTU per sq ft standard?
20 is a common rule of thumb; adjust for climate.
Do high ceilings require more BTU?
Yes, increase the BTU factor.
Should I round up?
Choose a unit with at least the calculated BTU.
Additional Information
- Rooms with significant sun exposure or poor insulation may need 10–20% more BTU capacity.
- High ceilings or large windows increase cooling demand and might require a higher BTU factor.
- Energy-efficient models can maintain comfort with slightly lower BTU ratings.