How to Use the Air Conditioner (BTU / Tonnage) Sizing Calculator
This calculator is designed to provide immediate answers without manual arithmetic or confusing steps. Simply input your values into the fields above; results update automatically as you adjust numbers. You can also customize your currency and tax preferences using the region selector in the header.
Formula & Calculation Method
Base BTU = Area (sq ft) × 20; Adjust +10% for sunny room, -10% for shaded, +600 BTU per extra person, +4000 BTU if kitchen
Our algorithms strictly follow standard international accounting, scientific, and engineering formulas to ensure 100% precision.
Frequently Asked Questions
Why is buying an oversized air conditioner a bad idea?
An oversized AC cools the room too fast without running long enough to remove indoor humidity, leaving the air feeling clammy, damp, and prone to mold.
How many BTUs are in 1 Ton of cooling?
1 Ton of air conditioning capacity equals 12,000 BTU per hour.