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Electricity Cost Calculator

Estimate your monthly power bill for any appliance or your entire home.

Wattage (W)

Hours per Day

Days per Month

Cost per kWh ($/kWh)

Common Appliances Reference

TV (LED)

100 W

Air Conditioner

1,500 W

Refrigerator

150 W

Washing Machine

500 W

Microwave

1,000 W

LED Bulb

10 W

Desktop PC

200 W

Electric Dryer

5,000 W

Water Heater

4,500 W

About Electricity Cost Calculator

Electricity Cost Calculator is a free online tool that helps you estimate your monthly power bill for any appliance or your entire home quickly and accurately. Whether you're a student, professional, or just need a quick answer, this calculator provides instant results with clear explanations. All calculations run locally in your browser — no data is stored or transmitted.

How to Use

Enter your values Fill in the required input fields with your numbers. Use tab to move between fields quickly.

See instant results Results calculate automatically as you type — no need to press a button. Watch the output update in real time.

Review the breakdown Check the detailed breakdown, charts, or tables below the main result for a deeper understanding.

Adjust and compare Change any input value to instantly see how it affects the result. Great for comparing different scenarios.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use Electricity Cost Calculator?

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Accurate & Reliable Electricity Cost Calculator uses standard mathematical formulas and algorithms, verified against reference implementations. Trust the results for homework, work, or personal use.

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Clear Explanations Get more than just a number. Where applicable, see step-by-step breakdowns, visual representations, and context that helps you understand the result.

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Instant Calculation Results update as you type — no need to press a calculate button or wait for a server response. Real-time feedback helps you explore different scenarios quickly.

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No Data Collection Your inputs are processed locally in your browser. No data is stored, transmitted, or used for any purpose. Close the tab and everything is gone.

Frequently Asked Questions

A kilowatt-hour (kWh) is the standard unit for measuring electrical energy consumption. It represents the energy used by a 1,000-watt appliance running for one hour. Your electricity bill is charged per kWh — so a 100W bulb running for 10 hours consumes 1 kWh.

The US national average electricity rate is approximately $0.13–$0.17 per kWh as of 2025, but rates vary widely by state. Hawaii has the highest rates (~$0.39/kWh) while Louisiana is among the lowest (~$0.09/kWh). Check your latest electricity bill for your exact rate.

Key tips: (1) Switch to LED bulbs — they use 75% less energy than incandescent. (2) Unplug devices on standby — phantom loads can account for 10% of your bill. (3) Use a programmable thermostat — heating/cooling is typically 50% of energy costs. (4) Run dishwashers and washers during off-peak hours. (5) Seal air leaks around windows and doors.