Labor cost of roasting coffee

Looking for ideas on the cost of roasting coffee. My labor. Gas usage, electricity , green cost, shrinkage, packaging, rent.
Is there a formula ?

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It’s not the. cost it’s the satisfaction of roasting.your own coffee trying different roasts, different beans , mixing and roasting for trying different tastes. I love roasting my own coffee it’s great

Here is a good starting point from Scott Rao