AC BTU Calculator
AC BTU Calculator | Window AC, Portable AC & Mini Split Room Size Guide
Find the right air conditioner BTU size by square footage, ceiling height, sunlight, room type, and insulation. Calculate window AC BTU, portable AC size, mini split capacity, bedroom AC size, and living room cooling needs.
Room AC Sizing
AC BTU Calculator
Enter your room details to find the right air conditioner size. Avoid undersizing or oversizing your AC unit.
Common room sizes:
AC Size Guide by Room Type
5,000 – 6,000 BTU
Small bedroom, home office (under 250 sq ft)
8,000 – 10,000 BTU
Bedroom, master bedroom (250 – 400 sq ft)
12,000 – 14,000 BTU
Living room, open plan (400 – 600 sq ft)
18,000 – 24,000 BTU
Large spaces, multiple rooms (600+ sq ft)
Base calculation: 20 BTU per square foot. Adjustments added for ceiling height, sunlight, occupants, kitchen, and insulation. For rooms over 1500 sq ft, consider central AC or multiple units.