Oh my!
Look a little more closely at that calculator. It really is simple to do what you want.
Insert the amount of money and the interest rate. Check whether the interest compounds itself.
Then plunk in a monthly withdrawal amount.
It will tell you how long it takes to get to zero.
If you want to take less time, increase the amount. More time, decrease the amount.
And the answer will be right there.
Maybe my view is skewed, as we had to estimate square and cube roots in the old days. Nothing to which we had access could figure them.
Arf