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Electricity Cost Calculator

Calculate appliance electricity costs per month and year.

Last updated: June 13, 2026

Calculator

Appliance Wattage

watts

Hours Used Per Day

Electricity Rate

cents/kWh

Results

Daily Cost$0.84

Monthly Cost$25.20

Yearly Cost$306.60

kWh Per Day6.00 kWh

How to Use This Calculator

1Enter the appliance wattage in watts.
2Enter hours of use per day.
3Enter your electricity rate in cents per kWh.
4View daily, monthly, and yearly electricity costs.

Formula Explanation

Electricity cost is calculated by converting wattage to kilowatts, multiplying by hours of use, and then by your electricity rate.

Cost = (Watts ÷ 1000) × Hours × Rate per kWh

Variables:

WattsPower consumption of the appliance

HoursDaily usage in hours

RateElectricity price per kilowatt-hour

Worked Examples

1500W space heater, 8 hrs/day, $0.12/kWh

1. kW = 1500 ÷ 1000 = 1.5 kW
2. Daily kWh = 1.5 × 8 = 12 kWh
3. Daily cost = 12 × $0.12 = $1.44
4. Monthly cost = $1.44 × 30 = $43.20

Result: $1.44/day, $43.20/month, $525.60/year

Why Use This Calculator

Calculate running cost of any appliance.
Compare energy costs between appliances.
Budget your monthly electricity bill.
Identify energy-wasting devices.

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Tips & Best Practices

The average US electricity rate is about 16 cents per kWh (varies by state).
LED bulbs use 75% less energy than incandescent bulbs.
Phantom loads (devices on standby) can add 5-10% to your electric bill.
Running appliances during off-peak hours may cost less with time-of-use plans.

Common Mistakes to Avoid

❌ Confusing watts and kilowatts.

✅ Divide watts by 1000 to get kilowatts. A 1500W heater is 1.5 kW.

❌ Not checking the actual wattage label on appliances.

✅ Check the label on your appliance or its manual for actual wattage — online estimates may differ from your specific model.

Frequently Asked Questions

What uses the most electricity in a home?

HVAC (heating/cooling) is typically the largest electricity user (40-50%), followed by water heating (14%), appliances (13%), and lighting (9%).

How do I find my electricity rate?

Check your electricity bill — the rate is listed in cents per kWh. The US average is about 16 cents/kWh but ranges from 10-40+ cents depending on your state.

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Height

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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