Calculator
Example Data Table
| AC Size | Input Power | Hours | Duty Cycle | Daily kWh | 30 Day kWh |
|---|---|---|---|---|---|
| 1 Ton | 1100 W | 8 | 70% | 6.64 | 199.20 |
| 1.5 Ton | 1650 W | 8 | 70% | 9.72 | 291.60 |
| 2 Ton | 2200 W | 8 | 70% | 12.80 | 384.00 |
Formula Used
Cooling kW = BTU per hour ÷ 3412.142
Power by COP = Cooling kW ÷ COP × 1000
Power by EER = BTU per hour ÷ EER
Average running watts = Compressor watts × Duty cycle + Fan watts + Standby watts
Daily kWh = Average watts × Hours per day ÷ 1000
Monthly kWh = Daily kWh × Billing days
Cost = kWh × Electricity tariff
Apparent power = Real watts ÷ Power factor
How to Use This Calculator
Enter the number of air conditioners first. Add the cooling capacity from the nameplate. Choose BTU, ton, or kW cooling. Select the method that matches your available data. Use direct watts when your label shows input power. Use COP, EER, or SEER when efficiency data is available.
Add daily use hours and billing days. Enter a duty cycle. This shows how often the compressor runs during operation. Add your electricity tariff per kWh. Include fan power, standby power, and power factor for better estimates. Press calculate to view energy use, billing cost, and apparent power.
Air Conditioner Power Consumption Guide
Why AC Energy Use Changes
An air conditioner does not always use its rated power. Its real use depends on heat load, room size, weather, insulation, filters, and thermostat setting. A hot room makes the compressor run longer. A shaded and sealed room reduces running time.
Understanding Rated Power
The rated input wattage is the easiest value to use. It is usually printed on the unit label. It shows the electrical power drawn when the compressor is working near rated conditions. Actual use may rise or fall during the day.
Using Duty Cycle
Duty cycle is an important option. A 70 percent duty cycle means the compressor runs for 70 percent of the selected hours. The fan and standby load are then added. This gives a more realistic average than using full power all the time.
Efficiency Methods
COP, EER, and SEER describe efficiency. A higher value means less electrical power for the same cooling output. COP compares cooling watts with input watts. EER compares BTU per hour with input watts. SEER is seasonal and often gives a broader estimate.
Cost Planning
Monthly cost is found by multiplying energy use by your tariff. This calculator also gives daily and annual estimates. These values help compare thermostat settings, inverter behavior, room habits, and different AC sizes before a bill arrives.
Better Estimates
Use real data when possible. Check your appliance label. Review your electricity bill for the correct tariff. Adjust the duty cycle after observing compressor behavior. Clean filters and close leaks to lower cooling load. Small changes can reduce long term energy cost.
FAQs
1. What does this calculator estimate?
It estimates air conditioner power, energy use, and cost. It can use rated watts, COP, EER, or SEER. It also includes duty cycle, fan load, standby power, tariff, and billing days.
2. What is duty cycle?
Duty cycle is the percentage of time the compressor runs. A 60 percent duty cycle means the compressor runs for 60 percent of the selected usage hours.
3. Which method should I choose?
Choose direct watts if your AC label shows input power. Choose COP, EER, or SEER when the label gives efficiency values instead of input wattage.
4. Is inverter AC power constant?
No. Inverter units vary compressor speed. Their power changes with heat load, set temperature, and room conditions. Duty cycle and average power help approximate that behavior.
5. Why is fan power included?
The indoor fan may keep running even when the compressor cycles off. Adding fan power gives a better estimate of total electrical use during cooling operation.
6. What is power factor used for?
Power factor helps estimate apparent power in VA. It is useful for wiring, generator sizing, and backup system planning. Billing usually depends on kWh for homes.
7. Can this calculator estimate monthly bills?
Yes. Enter your electricity tariff and billing days. The calculator multiplies monthly kWh by the tariff to estimate the monthly cost.
8. Why may my real bill differ?
Your bill may differ because weather, insulation, thermostat settings, maintenance, voltage, and other appliances affect total energy use. Use the result as a planning estimate.