Calculator
Air Conditioner Electricity Cost Calculator
Air conditioner price is only part of the cost. A unit that runs for many hours each day can add a meaningful amount to the monthly electricity bill, especially during heat waves or in regions with high energy prices.
This calculator uses a transparent formula: watts divided by 1,000, multiplied by hours per day, multiplied by days, then multiplied by your electricity price per kWh. The estimate is useful for comparing scenarios, but real use depends on thermostat setting, cycling, humidity, insulation, and outdoor temperature.
If you do not know the right capacity yet, start with theBTU calculator. If you are choosing between cooling types, use the type finder.
How to use the cost estimate
The calculator is most useful when you compare scenarios. Try a mild day, a heat-wave day, and an overnight bedroom schedule. Then compare those outputs with the cost of a more efficient unit, a better window seal, shading, or a higher thermostat setpoint. A small daily difference can become meaningful when cooling runs for several weeks.
Rated watts are not always the same as real average watts. A compressor cycles on and off, inverter systems modulate output, and portable air conditioners may run longer if the exhaust hose or window panel leaks heat back into the room. Use the label wattage as a conservative starting point, then adjust after checking a smart plug or utility usage data if available.
Electricity prices also vary by country, region, tariff plan, time of day, and taxes. If your bill separates supply, delivery, taxes, and fees, use the effective all-in price per kWh for a more realistic estimate. For time-of-use tariffs, run the calculator once for peak hours and once for off-peak hours, then add the results.
Use cost together with comfort. A fan may be cheaper but does not lower room air temperature. A split system may cost more upfront but use less electricity over repeated summers. A portable unit may be the only allowed option for a renter, even if it is not the lowest-cost cooling method.
For a better seasonal estimate, run the calculator more than once. Use one result for daytime cooling, one for overnight bedroom cooling, and one for extreme heat days when the compressor runs longer. Adding those scenarios gives a more honest monthly range than assuming the same runtime every day.
If the estimate feels high, the first fixes are usually shade, sealing, filter cleaning, thermostat discipline, and right-sizing. Replacing a working unit only makes sense when the energy savings are large enough to justify the upfront cost.
Recalculate after changing runtime, setpoint, room sealing, electricity tariff, season, or the air conditioner type being compared globally.