Central AC Running Cost Calculator
Free central ac running cost calculator. All prices are editable estimates, your local rates may differ.
Enter your values
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How to calculate
Formula: monthly kWh = watts ÷ 1,000 × hours per day × days per month. Cost = monthly kWh × rate.
Worked example: 3,500 watts, 8 hours per day, 30 days, rate $0.17 per kWh. Monthly use = 840 kWh, monthly cost = $142.80.
Tips
AC power varies with size and outside temperature. Use the watts from your unit label, and adjust hours for hot and cool months separately for a yearly estimate.
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Frequently asked questions
Are the prices accurate?
Prices are editable estimates. The defaults are typical US figures, and your local price can be higher or lower.