# AC size calculator: how many BTU do I need?

ENERGY STAR sizing table for a room with an 8-foot ceiling:

| Area (sq ft) | BTU per hour |
| --- | --- |
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
| 1,000 to 1,200 | 21,000 |
| 1,200 to 1,400 | 23,000 |
| 1,400 to 1,500 | 24,000 |
| 1,500 to 2,000 | 30,000 |
| 2,000 to 2,500 | 34,000 |

Adjustments: heavily shaded, 10% less; very sunny, 10% more; more than two people, add 600 BTU per extra person; kitchen, add 4,000 BTU. For a whole house, use a Manual J load calculation.

Interactive calculator: https://pros411.com/en/tools/ac-size-calculator