okay i was looking on here a couple of days ago cuz i was looking for light costs and it led me to this page. So i found a method and tryed using in and my ending prices were WAY off, so i dont kno who it was but he was wrong. but i did find another method that helped me so i thought id post it to help others.

• 400 watts x 24 hours x 30.5 days = 292,800 Total Watt-hours
• 292,800 Wh / 1000 Wh = 293 kWh
• 293 kWh x 10¢/kWh = $29/mo.; $351/yr.

I live in michigan and last months electric was 789 kwh and the bill was 84.44 so in my area its roughly 9.34 cents a kwh. Do the math problem ubove on a calulator so you do it right and then use ur watts and price to figure it out.