[ptero]

Yes, sorry to say, but this is a good idea (and you see plenty of those calculators), but assumptions and findings do not make sense. Inflation for long-term projections is one of the main drivers of the final results; you cannot ignore it.

It would be much better to make estimates in inflation-adjusted (today's) dollars: at least then one can relate the results to costs you see today. And even in pre-inflation dollars, average 9% return is anything but conservative.

On smaller points: adding "0" as an invest monthly option would be a good idea.