Room Heating BTU Calculator
Estimate required heating output by multiplying room area by a BTU per square foot factor.
CalcSimpler Examples
- 300 sq ft at 30 BTU/sq ft ⇒ 9,000 BTU/h
- 500 sq ft at 25 BTU/sq ft ⇒ 12,500 BTU/h
FAQ
What BTU factor should I use?
Typical homes use 20–40 BTU per square foot depending on climate.
Does ceiling height matter?
This simple estimate ignores ceiling height and insulation quality.
Is this for heaters or furnaces?
It estimates the heating output regardless of equipment type.
Additional Information
- BTU stands for British Thermal Unit.
- Higher BTU requirements occur in colder climates.
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