My last kid will graduate HS when I'm 60 so I'll work until at least then. Probably a few years after that. I really like what I do so I will want to keep working even after though I'd like to go on a couple missions.

Is there a calculator out there that says I have X dollars in a tax deferred account and I'll have Y dollars in taxable income once I (semi)retire; Here's how much I should convert from those tax deferred accounts every year?

I'm assuming it will be a little more complicated if I have zero income some years due to missions. Any tools for this type of planning?