Show HN: Freelancer Salary, calculator to match full time salaries

My #2 in a string of websites I'm trying to make this year.

When evaluating freelancing offers, I found myself writing a little script that did the math on how much more I'd need to charge.

Days off, self employment tax, health insurance.. lots of factors.

This simple web calculator does it for you.

Let me know if you have any feedback or additional factors I've forgotten to add!