AC Electricity Cost Calculator
Find how much electricity an air conditioner uses and what it costs to run, from its wattage, running hours and unit rate.
Recent
Formula
How the calculation works
The calculator converts the wattage into kilowatts by dividing it by one thousand.
It multiplies those kilowatts by the daily running hours and the number of days to get the kWh consumed.
It then multiplies the kWh by the rate per unit to show the total electricity cost.
Common mistakes
- Using the nameplate wattage instead of the real consumption, since an inverter unit modulates and uses far less in mild weather.
- Forgetting the fan, pump and servicing costs, which add to the total expense of keeping the unit switched on.
When to use it
- Households use it to see how much the air conditioner will add to the monthly bill before buying one or running it longer.
- Offices and shops use it to compare the running cost of an inverter unit with an ordinary one.
Worked example
A 1500 watt air conditioner running 8 hours a day for 30 days uses 360 kWh, and at 8 taka per unit the cost is 2880 taka.
Common questions
Should I use the wattage on the nameplate?
The nameplate shows the maximum wattage, so for a realistic estimate check a measured reading or use the average wattage given on the energy efficiency label.
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