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AC Electricity Bill Calculator

Calculate your air conditioner's monthly electricity cost based on tonnage, star rating, daily usage, and your state's tariff rates.

AC Details

Wattage: 1650 W

Monthly AC Cost

Goa - 1.5 ton, 3★

Fill in AC details and click Calculate

How is AC Electricity Consumption Calculated?

Running an air conditioner (AC) is often the largest contributor to a household's electricity bill in India. To understand how your AC consumption is calculated, you need to look at three main factors: AC tonnage, BEE star rating, and the hours of daily usage.

The Basic Formula

Electricity consumption is measured in Kilowatt-hours (kWh) or "Units":

Daily Units = (AC Power in Watts × Hours used per day) / 1000

Monthly Cost = Daily Units × 30 Days × State Tariff Rate

BEE Star Rating Impact

The Bureau of Energy Efficiency (BEE) rates ACs from 1 to 5 stars based on their ISEER (Indian Seasonal Energy Efficiency Ratio). A 5-star AC consumes roughly 20-25% less electricity than a 3-star AC of the same capacity.

Key Factors Affecting AC Bills

  • Inverter vs Non-Inverter: Inverter ACs adjust compressor speed continuously, saving up to 30-50% electricity compared to non-inverter models which constantly turn the compressor completely ON and OFF.
  • Thermostat Temperature: Setting your AC temperature to 24°C instead of 18°C can reduce your power bill significantly. Every 1°C increase saves roughly 6% of electricity.
  • Room Insulation: Open doors, unsealed windows, or direct sunlight on walls/roofs force the AC compressor to run longer at full speed, increasing electricity consumption.

Frequently Asked Questions

How much electricity does a 1.5 ton AC consume per hour?
On average, a 1.5 Ton AC consumes between 0.8 to 1.5 units (kWh) of electricity per hour of continuous operation. The exact amount depends on the BEE star rating, inverter technology, and the target room temperature you set.
Which is better for electricity bills: a 3-star or 5-star AC?
A 5-star AC is significantly better for reducing electricity bills. It is more expensive upfront but consumes 20-25% less power than a 3-star model. If you run your AC for more than 4-5 hours a day, the electricity bill savings will recover the extra purchase cost within 2 years.
At what temperature should I run my AC to save power?
The Bureau of Energy Efficiency (BEE) recommends setting your AC thermostat to 24°C to 26°C. Running your AC at 24°C provides comfortable cooling while saving up to 36% electricity compared to setting it at 18°C.
Does an inverter AC save electricity?
Yes, inverter ACs save substantial electricity (up to 30-50% compared to non-inverter ACs). A standard AC compressor turns off and on at full power to maintain temperature, which consumes a lot of startup current. An inverter AC compressor runs continuously at variable speeds, adjusting its power to keep a stable temperature.