I use as a rule of thumb, 4% per year is a safe withdrawal. If you are not of an age for Medicare and Social Security (65 and 66.5 sliding to 67) you can pull a bit more for a few year, but be careful. Use a calculator.

My investment management company does a Monte Carlo simulation of probabilities, updated once a year. Uses inflation growth for income needed. My parents made it to 88 and 94, so use age 95 for me. What is the percentage probability I will not run out by then? What is the most likely residual assets for my estate at death? You can calculate it as a single or a couple.