AC Wattage Calculator

Your details

Choose how you want to calculate wattage: from your AC unit specs or from electrical measurements.
Found on the unit's label or spec sheet. 12,000 BTU = 1 ton of cooling.
BTU/hr
Energy Efficiency Ratio. Window units: 8-12. Mini-splits: 10-20. Higher = more efficient.
Average number of hours the unit runs per day.
hrs/day
Your electricity rate in dollars per kilowatt-hour. Check your utility bill for the exact figure.
USD/kWh
Running wattageMedium unit
1,200W

Electrical power drawn while the unit is running

Running power1.2kW
Energy per day9.6kWh
Cost per day1.27USD
Cost per month37.99USD
Cost per year462.18USD
Cooling capacity1tons
Daily cost (USD)1.27
Monthly cost (USD)37.99

This AC unit uses 1200 W and costs about $462 per year to run.

  • The unit draws 1.200 kW, so every hour of running consumes 1.200 kWh of electricity.
  • 12000 BTU/hr equals 1.00 tons of cooling capacity.
  • An EER of 10 is on the lower end. A unit with EER 12+ would cost noticeably less to run.
  • At your entered rate and run time, running costs are about $1.27 per day.

Next stepTo reduce this cost, increase ventilation, raise the thermostat setpoint by 1-2 degrees, or consider a higher-EER replacement when the unit is due for renewal.

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