Free Air Conditioner Size Calculator
Determine the right air conditioner capacity in BTUs for a room based on its square footage.
sq ft
Recommended BTU
7,000 BTU
In Tons0.58 tons
Recommended BTU vs Room Area
How to Size an Air Conditioner
The general rule is 20 BTU per square foot. Adjust for sun exposure and occupancy.
Formula
Base BTU = Room Sq Ft x 20
Adjustments: +600 BTU per person over 2, +10% for sunny rooms, -10% for shaded.
1 ton = 12,000 BTU.
Example Calculation
350 sq ft room, average sun, 2 occupants.
- 01Base BTU = 350 x 20 = 7,000
- 02Occupant adjustment = 0 (2 or fewer)
- 03Sun factor = 1.0 (average)
- 04Recommended BTU = 7,000 x 1.0 = 7,000 BTU
- 05In tons = 7,000 / 12,000 = 0.58 tons
Frequently Asked Questions
Learn More
How to Calculate a Tip - Complete Tipping Guide
Learn how to calculate a tip at restaurants, salons, and other services. Covers standard percentages, mental math shortcuts, and how to split the bill fairly.