Great thread, I hadn't sat down to figure this out since I've made changes to what I'm doing.
How is everyone breaking down their rent? For example, if you harvest a pound after 56 days of flowering and your monthly rent is $500, then you would need to factor in a little under $1000 into your costs. Even if you're on a perpetual cycle cutting monthly, it still did take 2 months of flowering to get that pound, so 2 months of rent.
I have four 600w lights and some T5's for veg, harvest monthly, and will figure cost to run per pound, per month. I'll break down rent by square footage cut down per month, I know Wal-Mart likes to know how much their stores make and cost to run per sq ft...
Rent: approx 110 sq ft @ $600/month = $5.46/sq ft/month, harvesting 45 sq ft/month = $246
Electric: $250/month
Nutes: $60/month
Bulbs: $25/month, I change bulbs every 4 months
Water: free
Labor, not including trimming: approx 40 hours/month @ $30/hr =$1200
Trimming: $125 a pound x 2
Total $2031 per month for 2 pounds, which is $1015 per pound per month.
Of course, I do all the shit myself, so if I don't count my pay it costs me $581 per month for 2 pounds, so let's call it $300 a month per pound.
Damn, I could do so much better if I could make better use of the area I'm allotted to work with if I didn't have electrical constraints.