An electricity cost calculator helps you understand exactly how much each appliance in your home costs to run. By entering the wattage, daily usage, and your utility rate, you can identify energy hogs, compare appliances, and make smarter decisions about energy consumption to reduce your monthly electricity bill.
Appliance Details
Space Heater — Cost Breakdown
Household Total
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Monthly Cost Comparison
How to Use the Electricity Cost Calculator
Understanding your electricity costs appliance by appliance is the first step to reducing your monthly utility bill. This electricity cost calculator lets you estimate how much any device costs to run — then add multiple appliances to see your total household energy spend. All you need is the wattage (found on the device label or power adapter), your usage habits, and your electricity rate from your utility bill.
Step 1: Choose an Appliance Preset or Enter Wattage
Select a common appliance from the dropdown — options include a space heater (1,500W), refrigerator (150W), air conditioner (2,000W), clothes dryer (3,000W), EV charger (7,200W), and more. The wattage field will auto-fill with a typical value. If your appliance is not listed or you want a more precise figure, select "Custom wattage" and type the exact watts from the manufacturer's label. You can also enter a descriptive name (like "Bedroom Heater") to keep your household list organized.
Step 2: Set Your Usage Pattern
Enter how many hours per day and days per week you use the appliance. For appliances that run continuously (like a refrigerator), use 24 hours/day and 7 days/week. For seasonal appliances like an air conditioner, you might enter 8 hours/day and 5 days/week during summer months. These inputs control whether the electricity cost is calculated on a typical usage basis or a full-time basis.
Step 3: Enter Your Electricity Rate
The default rate is $0.13 per kWh, which is close to the U.S. national average. Find your exact rate on your electricity bill — it is usually listed as "energy charge" or "rate per kWh." Rates vary widely: California averages around $0.25/kWh, Texas around $0.12/kWh, and Hawaii over $0.35/kWh. Using your actual rate gives you the most accurate electricity cost estimate.
Step 4: Calculate and Review Results
Click Calculate Cost to instantly see daily, weekly, monthly, and yearly costs along with kWh consumption for each period. The electricity cost calculator uses the formula: kWh = (Watts × Hours/day × Days/week) / 1000 × (52/12 × 7) for monthly estimates, giving you a precise picture of your appliance's energy impact.
Step 5: Build Your Household Total
After reviewing a single appliance, click Add to Household List to include it in your running total. Repeat for each major appliance in your home. The household table shows all appliances side by side with their monthly and yearly costs, plus a grand total row. This makes it easy to spot your biggest energy consumers and prioritize where to cut back. Use the remove button to delete individual items or "Clear All" to start fresh.
FAQ
How do I calculate the electricity cost of an appliance?
Multiply the appliance wattage by the hours used per day to get daily watt-hours. Divide by 1000 to convert to kilowatt-hours (kWh), then multiply by your electricity rate ($/kWh). For example, a 1500W space heater running 8 hours a day at $0.13/kWh costs about $1.56 per day.
What is the average electricity rate in the United States?
The U.S. Energy Information Administration (EIA) reports the average residential electricity rate is approximately $0.13 per kWh nationally, though rates vary significantly by state. Hawaii has some of the highest rates (over $0.30/kWh) while states like Louisiana and Idaho have rates below $0.10/kWh. Check your utility bill for your exact rate.
Which household appliances use the most electricity?
The biggest electricity consumers in most homes are electric dryers (3000–5000W), electric ovens and ranges (2000–5000W), central air conditioning (2000–5000W), water heaters (3000–4500W), and pool pumps (1500–2500W). Space heaters (1500W) and EV chargers (7200W) can also add significantly to your bill when used frequently.
How does the multi-appliance total work?
After calculating each appliance, click 'Add to List' to add it to your household total. The tool accumulates all added appliances and shows combined daily, weekly, monthly, and yearly costs so you can see which appliances are driving your electricity bill. You can remove individual items or clear the entire list and start over.
Is this electricity calculator free to use?
Yes, this electricity cost calculator is completely free to use with no account or signup required. All calculations happen instantly in your browser — your data is never sent to any server or stored anywhere.
How accurate is the electricity cost estimate?
The estimates are accurate given the inputs you provide. Actual costs may vary because appliance wattage listed on labels is the maximum draw, and many appliances cycle on and off (e.g., fridges, AC units). For more precise estimates, use a smart plug or energy monitor to measure actual consumption rather than relying on rated wattage.
What is a kilowatt-hour (kWh)?
A kilowatt-hour (kWh) is the standard unit electric utilities use to measure and bill your electricity consumption. It equals 1,000 watts used for one hour — so a 100W light bulb running for 10 hours consumes 1 kWh. Your electricity bill charges you a rate (e.g., $0.13) for every kWh you consume in a billing period.