I’m a huge fan of Smart Asset, they have several helpful tools like 401k calculators, mortgage calculators, tax calculators as well as capital gains tax which is one of my favorites. Not counting the money I have put in my personal brokerage account here is the estimated rate of return for my 401k account assuming a 12% YoY return with 5% inflation per year by the time I retire at 66. Starting early is the winner. And now I can sit back and only put 7k a year in a single Roth IRA and live free.