BTU Calculator — Free Online Calculator with Step-by-Step Guide
Calculate the required BTUs for heating or cooling any room. Factors in climate zone, sun exposure, insulation, ceiling height, room type, and occupancy.
BTU Calculator
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AC Size (Tons)
1.1 ton
Recommended AC Unit
1.5 ton (18,000 BTU/h)
BTU per sq ft
34 BTU/sq ft
Room Factors
Climate: Zone 1 — Hot | Ceiling: 8ft | Sun: minimal | Insulation: poor | Room: standard | People: 1 | Purpose: cooling
Scenario Comparison
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BTU/h Required
13,560 BTU/h
BTU per sq ft: 34 BTU/sq ft
AC Recommendation
AC Size (Tons)
1.1 ton
Recommended AC Unit
1.5 ton (18,000 BTU/h)
Factor Breakdown
BTU by Room Type
Room Details
Climate: Zone 1 — Hot | Ceiling: 8ft | Sun: minimal | Insulation: poor | Room: standard | People: 1 | Purpose: cooling
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