Estimate cost per user for cloud infrastructure

Lets say that I have a product which allows users to sign up and sell personal services (think craigslist..etc). How do I estimate cost per user, cost per month..etc.

Basically, I am trying to figure out, how much should I be charging user so that I am atleast breaking even, and I want this trend to scale with users.

Is there a formula or other tools that allow to do this end to end cost estimation and growth simulation ?

submitted by /u/Party-Suggestion4558
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