Multiply the appliance's wattage by the number of operating hours, divide by 1,000 to convert to kilowatt-hours (kWh), then multiply by your electricity rate per kWh.
Heating and cooling systems typically account for 45–50% of home energy usage, followed by water heating (18%), major appliances (refrigerators, washers/dryers), and lighting.
Look at your most recent utility bill. Divide your total electric supply charge by total kWh used, or check the per-kWh rate listed on your statement.
Use energy-efficient settings (eco-mode), unplug appliances on standby, clean filters on AC units, and run high-wattage loads during off-peak rate hours if applicable.