Free BTU Calculator — Singapore
Find the right aircon size for your room. Our formula accounts for Singapore's tropical climate (+25% adjustment).
Estimates are for Singapore tropical climate conditions. Actual requirements vary with insulation quality, window glazing, appliances, and building type. Consult a professional for precise sizing.
How to use this BTU calculator
What is BTU?
British Thermal Units (BTU) measure an aircon's cooling power. A room that's too small a BTU rating will never reach your target temperature; too large wastes electricity and causes short-cycling.
Why Singapore needs more BTU
Our tropical climate adds a 25% load on top of standard calculations. West-facing HDB rooms in the afternoon can spike ambient temperatures by 5–8°C, requiring further adjustment.
Dirty coils reduce effective BTU
A clogged evaporator coil can reduce cooling output by 20–30%. If your correctly-sized AC still isn't keeping the room cool, a chemical wash restores full capacity — often without needing a larger unit.
Common Singapore aircon sizes
HDB bedroom (10–14 m²): 9,000–12,000 BTU (1 ton). HDB living room (20–28 m²): 18,000–24,000 BTU (1.5–2 ton). Condo master bedroom (16–20 m²): 12,000–18,000 BTU.
Your aircon not cooling even with the right size?
A chemical wash removes the mould and sludge blocking your evaporator coil. Fixed from S$80.
WhatsApp for a Chemical Wash Quote