Free Tool
Aircon BTU Calculator
Find the right aircon size for your room. Adjusted for Singapore's tropical climate.
Get a Professional Quote
Based on your BTU calculation, our technicians can provide an accurate quote including supply and installation.
Or WhatsApp us directlyResults are estimates. Actual requirements vary based on insulation, window sizes, appliances, and local conditions. Consult a professional for precise sizing.
How the BTU Calculation Works
Room Area
We calculate your floor area (length × width) in square metres.
Tropical Adjustment
Singapore's hot, humid climate requires 25% more cooling capacity than temperate countries.
Ceiling & Sun Factors
High ceilings and west-facing rooms need extra BTU; shaded rooms need less.
Occupancy & Usage
Each additional person adds ~600 BTU. Kitchens add 4,000 BTU for cooking heat.
Frequently Asked Questions
What is BTU and why does it matter for aircon?
BTU (British Thermal Unit) measures cooling capacity. Choosing the right BTU ensures your aircon cools efficiently without wasting electricity. Too small = insufficient cooling; too large = short-cycling and humidity problems.
Why does Singapore need more BTU than other countries?
Singapore's tropical climate with high temperatures (28–34°C) and humidity year-round means your aircon works harder. We apply a 25% tropical climate adjustment to ensure adequate cooling capacity.
What BTU do I need for a typical HDB bedroom?
A standard HDB bedroom (about 10–12 m²) typically needs 9,000–12,000 BTU — a 1 ton split unit. Use our calculator above for a precise estimate based on your specific room.
Can Coolbest help me choose the right aircon after I calculate my BTU?
Absolutely! Our technicians can recommend the best brand and model for your budget and usage. We supply and install all major brands with a 90-day workmanship warranty.