BTU Calculator

Estimate room cooling capacity in BTU/hr using dimensions, ceiling height, climate, sunlight, insulation and occupancy.

Estimate cooling capacity

Use room dimensions and common heat-load adjustments for a practical BTU/hr estimate.

Measurement unit

Room length

Room width

Ceiling height

Climate

Sun exposure

Insulation

Regular occupants

Room use

Recommended cooling capacity

—

Floor area—

Approx. AC tons—

Cooling kW—

Base load—

How the estimate is made

The calculator starts from room floor area, adjusts for ceiling height, climate, sun exposure and insulation, then adds occupancy and kitchen heat loads.

Sizing note

This is a practical estimate, not a professional Manual J load calculation. HVAC sizing can also depend on windows, construction, air leakage, humidity and local design temperatures.