An apparent opportunity has arisen, in which I’d bake bread to be sold at a local “artisan” sort of shop. My problem is, I can’t work out whether this is in any way a good opportunity financially. I can calculate what my bread will cost me per loaf, in terms of ingredients. I can calculate what my time is worth, and how much time actually goes into a given loaf. What I can’t figure out is how much it costs to run an oven. I have to have it on for about 1 hour before I begin baking anything, to get the stone fully heated. Then baking takes roughly 30 minutes, depending on the type of loaf. I figure that I can’t bake more than the equivalent of maybe 2 full hearth loaves in one go; with small baguettes (the kind you can do in something other than a proper deck oven), this means I can do maybe 4 per bake. This means that my oven runs: 1 hour setup 15 minutes per loaf (4 baguettes, bake 30-40 min, bring back to heat) So if I bake, say, 16 loaves a day, I have my oven running at about 425F for 5 hours a day. How do I work out what I’d be spending to do this? And are there additional costs I need to know or think about here? I know that local jurisdiction allows small-scale “artisanal” bakers and such to sell without expensive licensure and so forth, so long as they don’t have their own storefronts, but maybe I’m missing some other hidden costs?