Mini Split Size Calculator
Estimate preliminary mini-split capacity, tons, per-zone load, electrical input, daily energy and operating cost using editable area and adjustment factors.
Default project preview
27,225 BTU/h
Capacity equivalent
2.27 tons
Average per zone
13,612 BTU/h
Thermal capacity
7.98 kW
Electrical input
2.28 kW
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Base capacity uses area × entered load rate. Ceiling height, insulation, climate and reserve factors adjust capacity. Electrical input = thermal capacity ÷ COP.
FAQ
Mini Split Size Calculator questions
Should every room be a separate zone?+
Not necessarily. Zone layout depends on room loads, air movement, doors, use patterns and equipment options.
Why can oversized mini splits perform poorly?+
Oversizing can shorten cycles and reduce comfort or humidity control.
Does rated capacity stay constant in extreme weather?+
No. Heating and cooling output changes with outdoor and indoor conditions.