Room Information
Room Dimensions
Standard is 8 feet
Leave blank if using length × width above
Environmental Factors
Additional Factors
Additional people generate heat
Recommended Mini Split Size
Calculation Breakdown
Common Mini Split Sizes Near Your Requirement:
How This Calculator Works
Base Calculation: Starts with approximately 20 BTU per square foot as a baseline.
Adjustments Applied:
- Ceiling Height: Rooms with ceilings over 8 feet require proportionally more capacity
- Climate Zone: Hot climates (+30%), cold climates (+10%)
- Insulation: Poor insulation adds 20%, good insulation reduces by 10%
- Sun Exposure: Sunny rooms add 10%, shaded rooms reduce by 10%
- Room Type: Kitchens add 4,000 BTU for appliance heat
- Occupancy: 600 BTU added for each person beyond 2
Mini Split Sizing Guide
Properly sizing your mini split system is critical for efficient operation and comfort. An undersized unit will struggle to maintain temperature and run constantly, while an oversized unit will short-cycle and fail to properly dehumidify.
Common Mini Split Sizes: 9,000 BTU (3/4 ton), 12,000 BTU (1 ton), 18,000 BTU (1.5 ton), 24,000 BTU (2 ton), 30,000 BTU (2.5 ton), 36,000 BTU (3 ton)