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Electricity Cost Calculator

Calculate your monthly and annual electricity costs by appliance. Add multiple appliances with wattage, usage hours, and see a full cost breakdown.

Electricity Cost Calculator

Add your appliances and electricity rate to see a full cost breakdown.

Electricity Rate ($/kWh)

Appliances

Appliance

Wattage (W)

Hours / Day

Days / Month

Appliance

Wattage (W)

Hours / Day

Days / Month

Appliance

Wattage (W)

Hours / Day

Days / Month

Cost Summary

Monthly Cost

$161

Annual Cost

$1,935

Monthly kWh

960 kWh

Daily Cost

$5.38

Highest cost appliance: Air Conditioner at $141.12/month (87.5% of total)

Appliance	Watts	kWh/mo	Cost/mo	%
Air Conditioner	3,500	840.0	$141.12	87.5%
Refrigerator	150	108.0	$18.14	11.3%
TV	80	12.0	$2.02	1.3%

How Electricity Cost Is Calculated

Electricity cost for any appliance is calculated using a straightforward formula:

Monthly kWh = (Wattage × Hours Used Per Day × Days Per Month) ÷ 1,000

Monthly Cost = Monthly kWh × Electricity Rate ($/kWh)

For example, a 1,500-watt space heater used 4 hours per day for 30 days consumes (1500 × 4 × 30) / 1000 = 180 kWh. At the US average rate of $0.168/kWh, that costs about $30.24 per month.

Average US Electricity Rates by State

Electricity rates vary significantly across the United States. As of recent data, the national average is approximately $0.168 per kWh. However, rates differ by state:

Hawaii: ~$0.44/kWh — the highest in the nation due to heavy reliance on imported fuel.
California: ~$0.31/kWh — driven by renewable energy mandates and infrastructure costs.
Connecticut: ~$0.29/kWh — among the highest in the Northeast.
Texas: ~$0.14/kWh — benefits from deregulated energy markets and abundant natural gas.
Idaho: ~$0.10/kWh — low rates thanks to hydroelectric power.
Louisiana: ~$0.11/kWh — affordable due to natural gas production.

Top Energy-Consuming Appliances

Understanding which appliances consume the most electricity helps you focus your energy-saving efforts where they matter most:

Central Air Conditioning (3,500W): By far the largest electricity consumer in most homes, accounting for up to 40% of summer electric bills.
Electric Vehicle Charger (7,200W): Level 2 home chargers draw significant power, potentially adding $50–$100+ per month depending on driving habits.
Clothes Dryer (3,000W): Running a dryer 5 loads per week can cost $20–$30 per month.
Oven/Stove (2,500W): Electric ranges are heavy consumers, especially during holiday cooking.
Space Heater (1,500W): Often overlooked, portable heaters running several hours daily add up quickly.
Refrigerator (150W): While low-wattage, refrigerators run 24/7 and account for about 6–8% of household electricity use annually.

Tips to Reduce Electricity Costs

Switch to LED lighting: LED bulbs use about 75% less energy than incandescent bulbs and last 25 times longer. Replacing 10 incandescent bulbs saves roughly $100 per year.
Use a programmable thermostat: Setting your thermostat back 7–10°F for 8 hours a day can save up to 10% annually on heating and cooling.
Unplug phantom loads: Electronics on standby (TVs, chargers, gaming consoles) can account for 5–10% of home energy use. Use smart power strips to cut power when devices are off.
Run appliances during off-peak hours: Many utilities offer time-of-use rates. Running the dishwasher or laundry late at night or early morning can save money.
Upgrade to ENERGY STAR appliances: Certified appliances use 10–50% less energy than standard models. An ENERGY STAR refrigerator, for instance, uses about 15% less energy.
Air-dry clothes when possible: Skipping the dryer entirely saves $20–$30 per month. Even air-drying half your loads helps.
Seal air leaks and insulate: Proper insulation and weatherstripping around doors and windows reduce heating and cooling demand, lowering your HVAC costs by up to 20%.
Use ceiling fans strategically: A ceiling fan uses only 75W compared to 3,500W for AC. In moderate weather, fans alone may be sufficient.

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How to Use the Electricity Cost Calculator

1
Enter your values
Open the Electricity Cost Calculator and fill in the required input fields with your numbers or selections.
2
Review the calculation
The tool automatically computes the result as you type. Double-check your inputs to ensure accuracy.
3
Interpret your results
Review the calculated output along with any breakdowns, charts, or explanations provided to understand what the numbers mean for your situation.

Sources & Verification

NIST ISO

Published by ConvertCrunch Editorial Team | Our Methodology

Frequently Asked Questions

What is the Electricity Cost Calculator?

The Electricity Cost Calculator is a free browser-based tool on ConvertCrunch. Calculate your monthly and annual electricity costs by appliance. Add multiple appliances with wattage, usage hours, and see a full cost breakdown. It requires no downloads, installations, or account signups. Simply enter your values and get instant, accurate results. The tool is designed for quick calculations and informed decision-making, whether you are a professional, student, or everyday user looking for reliable answers.

How do I use the Electricity Cost Calculator?

Using the Electricity Cost Calculator is straightforward. Enter your values into the input fields provided on the page, then calculate or adjust parameters to explore scenarios. Most processing happens locally in your browser. If a feature uses a third-party service, the tool identifies that connection and the privacy policy explains it. Most users get the answers they need in under a minute.

Is the Electricity Cost Calculator free to use?

Yes, the Electricity Cost Calculator is completely free to use with no account signup, email requirement, or premium tier. Most calculations run locally in your browser. Features that depend on live data or a third-party service require a network connection and are identified in the tool. You can use it as many times as you need for personal, educational, or professional purposes.

How accurate is the Electricity Cost Calculator?

The Electricity Cost Calculator uses standard conversion factors and formulas from authoritative sources. For unit conversions, results are mathematically precise. For tools relying on external data (such as currency rates), values are updated regularly but may have a short lag compared to real-time market data. Results are suitable for everyday use, planning, and quick reference.

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How Electricity Cost Is Calculated

Electricity cost for any appliance is calculated using a straightforward formula:

Monthly kWh = (Wattage × Hours Used Per Day × Days Per Month) ÷ 1,000

Monthly Cost = Monthly kWh × Electricity Rate ($/kWh)

For example, a 1,500-watt space heater used 4 hours per day for 30 days consumes (1500 × 4 × 30) / 1000 = 180 kWh. At the US average rate of $0.168/kWh, that costs about $30.24 per month.

Average US Electricity Rates by State

Electricity rates vary significantly across the United States. As of recent data, the national average is approximately $0.168 per kWh. However, rates differ by state:

Hawaii: ~$0.44/kWh — the highest in the nation due to heavy reliance on imported fuel.
California: ~$0.31/kWh — driven by renewable energy mandates and infrastructure costs.
Connecticut: ~$0.29/kWh — among the highest in the Northeast.
Texas: ~$0.14/kWh — benefits from deregulated energy markets and abundant natural gas.
Idaho: ~$0.10/kWh — low rates thanks to hydroelectric power.
Louisiana: ~$0.11/kWh — affordable due to natural gas production.

Top Energy-Consuming Appliances

Understanding which appliances consume the most electricity helps you focus your energy-saving efforts where they matter most:

Central Air Conditioning (3,500W): By far the largest electricity consumer in most homes, accounting for up to 40% of summer electric bills.
Electric Vehicle Charger (7,200W): Level 2 home chargers draw significant power, potentially adding $50–$100+ per month depending on driving habits.
Clothes Dryer (3,000W): Running a dryer 5 loads per week can cost $20–$30 per month.
Oven/Stove (2,500W): Electric ranges are heavy consumers, especially during holiday cooking.
Space Heater (1,500W): Often overlooked, portable heaters running several hours daily add up quickly.
Refrigerator (150W): While low-wattage, refrigerators run 24/7 and account for about 6–8% of household electricity use annually.

Tips to Reduce Electricity Costs

Switch to LED lighting: LED bulbs use about 75% less energy than incandescent bulbs and last 25 times longer. Replacing 10 incandescent bulbs saves roughly $100 per year.
Use a programmable thermostat: Setting your thermostat back 7–10°F for 8 hours a day can save up to 10% annually on heating and cooling.
Unplug phantom loads: Electronics on standby (TVs, chargers, gaming consoles) can account for 5–10% of home energy use. Use smart power strips to cut power when devices are off.
Run appliances during off-peak hours: Many utilities offer time-of-use rates. Running the dishwasher or laundry late at night or early morning can save money.
Upgrade to ENERGY STAR appliances: Certified appliances use 10–50% less energy than standard models. An ENERGY STAR refrigerator, for instance, uses about 15% less energy.
Air-dry clothes when possible: Skipping the dryer entirely saves $20–$30 per month. Even air-drying half your loads helps.
Seal air leaks and insulate: Proper insulation and weatherstripping around doors and windows reduce heating and cooling demand, lowering your HVAC costs by up to 20%.
Use ceiling fans strategically: A ceiling fan uses only 75W compared to 3,500W for AC. In moderate weather, fans alone may be sufficient.