Electricity question

I am going to be running one 400w hps and a 250w MH fixture, just wanted to know how much the electric bill will jump? MH will be on 18/6, hps 12/12

Look at your electric bill at how much you get charged per kilowatt hour, then take your total number of Watts × Hours Used Per Day ÷ 1000 = Daily Kilowatt-hour consumption then take that number and then multiply that by your cost per kilowatt hour.

mine bill went up $30 dollars with my 400hps and 250 mh