Cool tool, thanks for sharing!

I did the same thing with building something in excel - I didn't think as hard about the retirement portion though and just matched it to my previous pension contributions from when I was employed, so that's a great addition.

One thing I have in my sheet that I find helpful: A comparison with an equivalent annual salary at an employer. For example I have a day rate that is a rough approximation to match the annual salary I'd like to have if I were employed by someone - taking into account that the day rate needs to include sick days, holidays, the employer's share of insurance and pension contributions that I now pay etc.