Window Air Conditioner Size Calculator
Find the BTU size of window air conditioner a room needs, from its size, sun, occupants and whether it's a kitchen.
Change the values and press Calculate to work out your own figures.
Enter the room's size and conditions.
Show the working
- capacity = table × sun (0.9 shaded, 1.1 sunny) + 600 per person over 2 + 4,000 for a kitchen
How to use it
Enter the room's size and conditions.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
capacity = table capacity × sun + 600 × (people − 2) + 4,000 for a kitchen
Ceilings
The table assumes 8 ft ceilings; size up for higher ceilings or a room open to others.
Questions
What size window AC for a 12 × 12 ft room?
5,000 BTU/h.
Formulas
capacity = table capacity × sun + 600 × (people − 2) + 4,000 for a kitchen
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.