Air Conditioner BTU Calculator
Estimate cooling BTU requirement from square footage and load factors.
This page is an editable estimator with realistic defaults so you can model your own situation in minutes.
Cooling BTU = square footage x BTU per square foot x adjustment factors.
Treat the result as a planning estimate and verify important numbers with the relevant official source before acting.
| BTU per sq ft | 25 |
|---|
Assumptions
- This is a rough sizing estimate, not a Manual J load calculation.
- Insulation, windows, air leakage, climate, orientation, occupancy, and duct design can change HVAC sizing.
- Confirm HVAC sizing with a qualified contractor.
How this calculator works
Formula used
Cooling BTU = square footage x BTU per square foot x adjustment factors.
Example calculation
Plug in your own numbers and the result updates instantly. Cooling BTU = square footage x BTU per square foot x adjustment factors.
Air Conditioner BTU Calculator FAQ
Is this air conditioner btu calculator exact?
No. It is an estimating tool only. Actual quantities can change with field measurements, waste, layout, product dimensions, building codes, soil conditions, and installer methods.
Should I add extra material?
Usually yes. Many projects use a waste factor for cuts, breakage, overlap, spillage, grading, or mistakes. The best waste factor depends on the material and layout.
Should I verify before ordering?
Yes. Confirm quantities with your contractor, supplier, plans, local code requirements, and product installation instructions before purchasing materials.