As my girlfriend also started freelancing last year, I decided to turn my Excel sheet into a little program she could use too, and in the spirit of sharing and helping others I would hereby like to make it available to you all too :)
My biggest take-away so far has been that most people dramatically underestimate how much they need to set aside, and forget to plan adequately for getting sick and for retirement.
You can find the tool here: https://howmuch.probsteide.com/
Comments, questions, and suggestions are more than welcome!
I wish you all a happy Easter Weekend!
In case you skipped to the bottom: you can find the tool at https://howmuch.probsteide.com/