BTU Calculator
Estimate the BTU (heating/cooling capacity) needed for a room.
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How it works
- 1
Enter room area
Area in square feet.
- 2
Enter occupants
More occupants add to the estimate.
FAQ
- How accurate is this?
- It’s a standard rule-of-thumb estimate (20 BTU per sq ft) — ceiling height, insulation, windows and climate can shift the real number, so treat it as a starting point.