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How to Calculate Your Air Conditioner Electricity Cost
A formula anyone can use, with worked examples for 9000, 12000, 18000, and 24000 BTU units.
By เจิดพงษ์ มากกูล1 min read
You only need three numbers from the AC label: cooling capacity (BTU), input power (W), and your electricity rate (THB/kWh).
The formula
Worked examples (Inverter, 4.4 THB/kWh)
Real-world adjustment
The numbers above are average — inverters draw less once the room hits target. For typical Thai bedrooms, multiply the spec wattage by 0.7 to estimate average draw. Non-inverter units, multiply by 0.95.
Monthly bill estimate
Hours per night × cost per hour × 30 = monthly bill. Sleeping 8 hrs a night with a 12,000 BTU inverter ≈ 4.4 × 8 × 30 = 1,056 THB/month.
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