Electricity Cost Calculator

The calculator converts your appliance's power rating to kilowatts, then multiplies it by your usage hours per day to get daily kWh consumed. It then multiplies that figure by your electricity rate to produce daily, monthly, and annual cost estimates. The core formula is: Cost = Power (kW) × Usage (hours) × Rate ($/kWh).

In the United States, the average residential electricity rate is around $0.13–$0.16 per kWh, but it varies significantly by state and provider. States like Hawaii and California have higher rates (above $0.20/kWh), while states like Louisiana and Oklahoma tend to be lower. Check your monthly electricity bill for your exact rate.

A watt (W) is a unit of power — the rate at which energy is used. A kilowatt (kW) equals 1,000 watts. A kilowatt-hour (kWh) is a unit of energy representing 1 kW of power used continuously for one hour. Electricity bills charge you for kWh consumed, not the wattage of your appliances.

Most appliances have a label on the back or bottom showing their power rating in watts (W) or kilowatts (kW). You can also check the product manual or the manufacturer's website. For appliances rated in amps, multiply the amperage by the voltage (typically 120V or 240V in the US) to get watts.

The biggest electricity consumers in a typical home include HVAC systems (1,000–5,000W), electric water heaters (4,000–5,000W), clothes dryers (5,000W), refrigerators (150–400W continuously), and electric ovens (2,000–5,000W). Identifying these high-draw appliances and moderating their usage can lead to significant savings.

Start by switching to LED lighting, which uses up to 80% less energy than incandescent bulbs. Unplug devices on standby, use smart power strips, set your thermostat a few degrees higher in summer and lower in winter, and run major appliances like dishwashers and washing machines during off-peak hours. Upgrading to ENERGY STAR-rated appliances also delivers long-term savings.

Add up the estimated monthly kWh usage of all your major appliances using this calculator, then multiply the total kWh by your electricity rate. Don't forget to add any fixed charges or delivery fees shown on your electricity bill, as these can meaningfully affect your total cost.

Electricity bills fluctuate due to seasonal changes in heating and cooling demand, variable usage habits, changes in your utility's rate structure, and time-of-use pricing if your plan has peak and off-peak rates. Extreme temperatures typically push bills higher because HVAC systems work harder to maintain comfortable indoor temperatures.