HVAC Load Calculator
Estimate the BTU and ton capacity you need to heat or cool your home using a Manual J–style rule of thumb.
Recommended capacity
50,625 BTU/hr
Approx. 4.2 tons
Rule-of-thumb estimate. A Manual J load calculation by a licensed HVAC contractor is required for correct sizing.
Frequently asked questions
Is this the same as Manual J?
No. Manual J is a detailed room-by-room load calculation by a licensed HVAC contractor. This tool gives a quick estimate.
Can I just use square footage?
Square footage alone often oversizes equipment. Climate, insulation, and ceiling height matter.
What size AC do I need?
1 ton (12,000 BTU) cools about 400–600 sq ft in a moderate climate.