Bedroom Air Conditioner BTU Calculator
An undersized AC runs constantly, an oversized one cools unevenly and leaves the room clammy. Enter your bedroom details for a starting size.
Result
- Room area
- 144 sq ft
- Calculated need
- 2,880 BTU
- Unit size to look for
- 5,000 BTU
This follows the common ENERGY STAR sizing guidance. Portable AC ratings are often lower in practice than window units with the same label.
How this calculator works
Base capacity is about 20 BTU per square foot. We reduce it 10% for a shaded room, add 10% for a very sunny room, and add 600 BTU for each person beyond two, then round up to the nearest common unit size.