How much more than my mortgage should I charge for rent?
Your reasoning is backwards. As others have pointed out, you cannot just decide how much you charge irrespective of the market. Let me paraphrase a little economics 101 to underline why you also should not think like this: You can see a rental property like your house (the same reasoning is usually explained with the example of hotel rooms) as a series of perishable goods. Your house represents the potential sale of the January rent (which perishes once January is over), plus the February rent etc. Your approach was to compute the total costs (all fixed and variable costs of owning that house as well as costs associated to renting specifically) and average them over the time period so that you know how much to ask at least. Assuming that you are only looking to rent it out, not sell it or let a family member live there, you can't think like this. Most of those costs that you averaged are what economists call sunk costs. You have already incurred the mortgage costs and they are not affected by your decision to rent or not to rent. These costs are irrelevant to your decision making process. You only need to think about marginal costs: those additional costs that you have when you rent but not when you don't. Look at the market prices for renting similar properties in that region and compare them with your marginal costs. As long as they are higher than your marginal costs, rent it out. This does not mean that you are sure to make profits, but it means that you are sure to make less losses than in your only alternative of not renting.