Coast FIRE calculator

https://yenkee-wiki.win/index.php/How_a_401(k)_Withdrawal_Calculator_Can_Clarify_Your_Retirement_Planning

A Coast FIRE calculator helps you figure out how much you need saved so that, even without future contributions, your investments will grow to cover your retirement expenses by your target age. It’s surprisingly freeing to see your 'coast number'—the point where compound interest can do the heavy lifting while you work a less stressful job.