⚡Electricity Cost Calculator

Use this electricity cost calculator to find out exactly how much any appliance costs to run per day, month, and year. Whether you want to know how to calculate your electric bill from scratch or just check the cost of one device, the process is the same: take the appliance wattage, your daily usage hours, and your electricity rate per kWh, and the math does the rest. Understanding power consumption in kilowatt-hours (kWh) is the first step toward cutting your utility bill.

Electricity Cost Calculator per kWh for Appliances

Every appliance draws a certain number of watts while running. To find the energy cost, convert those watts to kilowatts by dividing by 1,000, then multiply by the number of hours the appliance runs each day. The result is your daily kilowatt-hour consumption. Multiply that figure by your electricity rate to get the daily cost, and scale up to monthly or annual figures from there.

For example, a 1,500-watt space heater running 8 hours per day consumes 12 kWh daily. At the US average rate of roughly $0.17 per kWh, that is about $2.04 per day, $61 per month, and $745 per year. The same formula applies to every device in your home.

Common appliance wattages to plug into this electricity cost calculator:

• LED light bulb: 8 to 15 watts
• Laptop computer: 30 to 60 watts
• Desktop computer with monitor: 150 to 300 watts
• 32-inch LED TV: 30 to 55 watts
• Refrigerator: 100 to 200 watts (runs intermittently, roughly 30 to 50 percent of the time)
• Dishwasher: 1,200 to 1,500 watts
• Electric oven: 2,000 to 5,000 watts
• Central air conditioner: 3,000 to 5,000 watts
• Space heater: 750 to 1,500 watts
• Electric water heater: 4,000 to 5,500 watts

Check the label on the bottom or back of each appliance for its rated wattage. If the label shows only voltage (V) and current in amps (A), multiply the two numbers together to get watts.

Monthly Electricity Bill Estimator by Usage

Your monthly electricity bill reflects total household energy consumption across every device running in your home. To build a full monthly electricity bill estimator, run this calculator for each major appliance and add the results together. The largest contributors in most households are heating and cooling (which can account for 40 to 50 percent of total usage), water heating, refrigeration, and laundry appliances.

Finding your electricity rate is straightforward. Locate your most recent utility bill and look for a line labeled "energy charge," "consumption charge," or "rate per kWh." Rates vary significantly by state and provider. If your bill uses tiered pricing, where higher usage triggers a higher rate, divide your total electricity charge by the total kWh used that billing period to get an effective blended rate. That blended rate is the most accurate single figure to use in this calculator.

Many utilities also offer time-of-use pricing, which charges less per kWh during off-peak hours (typically overnight) and more during peak demand periods in the afternoon and early evening. If you are on a time-of-use plan, run the calculation separately for peak and off-peak usage hours and add the two costs together for a more accurate picture of your energy cost.

How to Calculate the Cost to Run an Appliance

Follow these four steps to calculate the cost to run any appliance:

• Step 1: Find the wattage on the appliance label (in watts, W).
• Step 2: Divide the wattage by 1,000 to convert to kilowatts (kW).
• Step 3: Multiply kilowatts by the number of hours used per day to get daily kWh.
• Step 4: Multiply daily kWh by your electricity rate (dollars per kWh) to get the daily cost.

To get the cost per month, multiply daily kWh by 30 (or your actual days per month) and then by your rate. To get annual cost, multiply daily kWh by 365 and then by your rate.

Energy efficiency upgrades produce measurable savings once you run these numbers. Switching one 60-watt incandescent bulb to a 10-watt LED and running it 5 hours daily saves roughly $9 per year at average rates. Multiply that across every bulb in a home, and the annual savings are significant. Replacing an old refrigerator with a modern Energy Star model can reduce that appliance's energy cost by $100 to $200 per year due to vastly improved compressor efficiency.

Standby power, sometimes called vampire power, also adds up. Devices left plugged in but not actively running, such as cable boxes, game consoles, and smart TVs in standby mode, can collectively consume 50 to 100 watts continuously. At average rates, that adds $65 to $130 to your annual utility bill without providing any active benefit. Smart power strips and scheduling appliance power cycles can recover most of that waste.

Understanding the CO2 Estimate

This calculator also estimates the carbon dioxide emissions associated with your appliance's power consumption. The US EPA national average grid emission factor is approximately 0.386 kilograms of CO2 per kWh. The actual emission intensity of your local grid depends on the energy mix in your region. Areas with significant hydroelectric or renewable generation will have lower emission factors, while regions relying heavily on coal-fired generation will be higher. Your local utility may publish a specific emissions rate for your service area.