Power consumption & energy usage of air conditioners

Air conditioners are one of the major power-consuming loads at home. This calculator can help you calculate electricity usage of your air conditioner and the usage cost.

How to use air conditioner electricity usage cost calculator

  • Input AC rating in Tons or kW or BTU/hr and select input.
  • Enter Star or SEER rating whichever is known.
  • Enter other details and click on calculate.

Energy usage of Air conditioners

To check the current electricity price per kWh in your region refer to Global Electricity rates. It is necessary to enter the right cost per unit(kWh) to find the exact price.


Use the below calculator for air conditioner electricity usage cost calculator:

Enter rated cooling:
Efficiency rating:
SEER/Energy stars:
Average operating hours per day:
Number of days operation:
Cost per unit*:(Global Electricity rates)
Power Consumed:
Total Energy Consumed:
Total Air conditioning cost*:
*The cost is currency independent and same that of cost per unit input given.

Air conditioning units are rated in tons. One ton is equal to 12,000 Btu per hour (3.517 kW). That is the amount of heat required (288,000 Btu) to melt one ton of ice in a 24-hour period. Therefore 288000, when divided by 24, gives 12000Btu, which is equal to one ton.

The Energy Efficiency Ratio (EER) is the ratio of output cooling energy (in BTU/hr) to input electrical energy (in watts) at a given operating point. EER is normally calculated with a 95 °F (35 °C) outside temperature and a room temperature of 80 °F (26.6 °C) and at a relative humidity of 50%.

EER = (Cooling energy in BTU/ hr) / (Electrical energy consumed in watts)


EER = (Cooling energy in kW/ hr) / (Electrical energy consumed in watts)

*Either of the above formulae can be used based on the local standard.

Power consumed by split A/C

1 Ton1.5 Ton2 Ton
1 Star1100W1651W2200W
2 Star1036W1554W2071W
3 Star940W1408W1878W
4 Star782W1174W1565W
5 Star781W1172W15623W

Power consumed by window A/C

1 Ton1.5 Ton2 Ton
1 Star1355W2032W2710W
2 Star1279W1918W2557W
3 Star1174W1761W2348W
4 Star1100W1650W2200W
5 Star1065W1599W2131W

Note: All the above are estimated values. The actual power consumption varies slightly.

Electricity Bill calculation

From the above table, energy consumption can be calculated as follows:

Lets calculate the power consumed by a 1.5 ton 5 star rated split a/c operated for 10hrs.

Number of Units consumed = (Power consumed in kW) x (Operation Hours)

Power consumed can be noted from the table above or from the brochure or nameplate details of the air conditioner.

Number of Units consumed = (1172/ 1000) kW x 10 hrs

=11.72 units (kWh)

Electricity bill = Number of units consumed x Rate per unit

Read the below article on Power Consumption & Electricity Bill Calculation for air conditioners for more detailed explanations and to know the basic parameters that affect the performance of your air conditioner.

energy usage of air conditioners

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