Electricity Cost Calculator

Calculate electricity costs for any appliance

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About Electricity Cost Calculator

An electricity cost calculator that estimates power consumption costs from wattage, usage time, and electricity rate. Supports common appliance presets (AC, heater, fridge, TV, gaming PC), shows kWh consumption and cost per day, month, and year. Helps identify energy-hungry devices and plan electricity budgets. All calculations are client-side.

Electricity Cost Calculator Features

  • Watt to cost
  • Daily/monthly/yearly
  • Appliance presets
  • kWh tracking
  • Rate input
Understanding electricity costs helps manage energy bills and make smarter appliance choices. Cost = (Watts × Hours / 1000) × Rate per kWh. A 100W bulb running 10 hours at $0.12/kWh costs $0.12 per day — or about $43.80 per year.

How to Use

Enter appliance details:

  • Wattage: Device power consumption (W)
  • Hours/day: Average daily usage
  • Rate: Your electricity rate ($/kWh)

The Formula

Daily kWh = Watts × Hours / 1000. Daily cost = kWh × Rate. Monthly = Daily × 30. Yearly = Daily × 365.

Energy Saving Tips

  • LED bulbs use 75% less energy than incandescent
  • A/C costs $0.10-0.50/hour depending on size and efficiency
  • Standby power (phantom load) can add 5-10% to bills

Step-by-Step Instructions

  1. 1Enter device wattage or select a preset.
  2. 2Set daily usage hours.
  3. 3Enter your electricity rate.
  4. 4View daily, monthly, and yearly costs.
  5. 5Compare different appliances.

Electricity Cost Calculator — Frequently Asked Questions

Where do I find my electricity rate?+

Check your electricity bill — it shows the rate per kWh. US average is about $0.12-0.16/kWh, but varies widely by state ($0.10 in Louisiana to $0.35+ in Hawaii).

How many watts does an air conditioner use?+

Window units: 500-1500W. Central AC: 3000-5000W. A 1500W window unit running 8 hours/day at $0.12/kWh costs about $43/month.

What uses the most electricity at home?+

Typically: HVAC (heating/cooling) 40-50%, water heating 14-18%, appliances 13%, lighting 9%. Actual usage varies by climate and habits.

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