Consumo AC mensal
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Monthly AC Consumption Calculator estimates energy usage in kilowatt-hours (kWh) based on the appliance's power, daily usage hours, and days in a month. It uses the formula E = P·h·days/1000, where P is power in watts, h is average daily hours, and days refer to the period. This helps plan energy costs or compare the efficiency of different AC models.
To use, input the AC's power (in watts), average daily runtime, and desired days. The calculator converts watts to kilowatts (dividing by 1000) and multiplies by the other values. Note that actual consumption may vary if the AC cycles on/off, as in temperature-controlled systems. For systems with automated temperature control, the result is an approximation.
If the appliance has an on/off cycle (common in residential air conditioning), the result will be approximate. For greater accuracy, use real electricity bill data. Also verify the AC's rated power matches the manual specifications, as some models may vary due to environmental factors.
Frequently asked questions
How does the formula handle units that don't run all day?
The formula uses average hours per day but doesn't account for on/off cycles. If the AC stops running to maintain temperature, actual consumption will be lower than calculated.
Do I need to convert watts to kilowatts before using the calculator?
No, the calculator automatically converts watts to kilowatts by dividing by 1000 during the calculation.
Can it be used for window and split units?
Yes, as long as the stated power is accurate (usually found in the unit's manual).
Does the result include electricity tariffs?
No, the result is only the consumption in kWh. For cost in currency, multiply by your utility's rate.