HVAC BTU & AC Tonnage Calculator by Square Footage (2026)

When to use this tool: Use this sizer when buying a new air conditioner, heat pump, mini-split, or furnace to find out how many BTUs per hour (or Tons) of capacity your home requires. (1 Ton of HVAC capacity = 12,000 BTU/hr).

Room or Home Area (Sq Ft) ?Enter the square footage of the single room (for a mini-split or window AC) or entire house (for a central heat pump or furnace).

Ceiling Height ?Higher ceilings increase the total cubic feet of air your HVAC equipment must heat or cool.

Sun Exposure & Windows ?South- and west-facing windows increase summer solar heat gain, requiring additional cooling capacity.

Climate Zone ?Cold northern winters require higher heating BTU output per square foot than mild coastal climates.

Recommended HVAC Equipment Capacity

56,000 BTU/hr (4.5 Tons)

Calculate Monthly Utility Bills for This Size →

HVAC BTU & Heat Pump Tonnage Sizer

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