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The average electricity consumption of a US family of four is in the neighborhood of 50 kWh per day, or 1,500 kWh per month. Similar figures apply for Canada. Assuming an average electricity cost of $0.12 per kWh, that translates into about $6 per day for electricity, or $180 per month.
4. Multiply the unit's kWh/day by the number of days you'd use it during the period you'd like to calculate. So to estimate an appliance's energy use in kWh per month, multiply its kWh/day by 31 (or 28, 29 or 30 depending on how many days there are in the month you want to measure).o continue the earlier example of the window fan, if energy costs 17 cents/kWh in your area, running the fan as estimated earlier for one year will cost you approximately 1.25 (kWh per day) * 365 (days--the time period) * .17 (cost of energy/kWh) = about $77.56 per year if you use the fan every day.