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How to calculate my real earnings from hourly temp-to-hire moving to salaried employee?
Get some professional accounting help. You're going to have to pay for everything out of the fee you charge: taxes, retirement, health care, etc. You'll be required to pay quarterly. I don't think you should base your fee on what "this" company will pay as a full-time employee, but what you can expect in your area. They're saving a lot of money not going through an established employment firm and essentially, making you create your own. There are costs to setting up and maintaining a company. They have less risk hiring you because there are no unemployment consequences for letting you go.  Once you're hired, they'll probably put you on salary, so you can forget about making more money if you work over 40 hrs. IMHO - there have to be better jobs in your area than this one.