Traditional retirement calculators don't work very well when you have real estate. I would build a financial model in excel so you can model as you see fit.
There are ways you can develop more passive real estate cash flow for retirement without totally divesting your real estate holdings. As Kevin mentioned you will have significant tax hit if you sell due to depreciation recapture and appreciation. I am applying some of these techniques right now to develop passive cash flow for early retirement
1) cash refinance your properties and invest the cash in syndication or larger multifamily where you can use property management. choose based on how involved you want to be.
2) 1031 into more passive investments like DST, commercial or larger multi family
3) 1031 into properties you might want to vacation in and do VRBO or Airbnb
These techniques can accomplishes a few things, they can be more tax efficient and will keep you much more diversified than selling and investing everything in the stock market. Also, real estate is a good hedge for inflation.