Electricity Cost Calculator
Free online Electricity Cost Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Cost = (Wattage x Hours / 1000) x Rate per kWh. Daily = Wattage x Hours/Day / 1000 x Rate. Monthly = Daily x 30. Annual = Daily x 365.
Example Calculations
Space Heater
Input: 1,500W, 8 hours/day, $0.14/kWh
Result: Daily: $1.68, Monthly: $50.40
Air Conditioner
Input: 3,500W, 10 hours/day, $0.12/kWh
Result: Daily: $4.20, Monthly: $126.00
LED Bulbs
Input: 10 bulbs x 10W, 5 hours/day, $0.13/kWh
Result: Daily: $0.065, Monthly: $1.95
About This Calculator
Free online electricity cost calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our electricity cost calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
Cost of running an appliance?
Wattage x hours / 1000 = kWh, then multiply by electricity rate. 1500W x 8hrs at $0.12/kWh = $1.44/day.
What uses most electricity?
Heating/cooling ~46%, water heating ~14%, appliances ~13%, lighting ~9%.
How to read electricity bill?
Shows kWh used, rate per kWh, and fixed charges. Some have time-of-use rates.
What is a kilowatt-hour?
Energy used by a 1000W device in one hour. Standard billing unit. 100W bulb x 10hrs = 1 kWh.
Reduce electricity bill?
LED bulbs, programmable thermostats, unplug devices, full loads in washer/dishwasher. ENERGY STAR saves 10-50%.