One calculation I've seen others recommend here is to run a simulation/estimation of your house sale alone funding your future housing costs.
So, say you can net $500K selling your house. Look at your projected investment returns, and say you expect you'll earn an average of 7% over the next 40 years (or whatever your projection is for your survival). Then find your SWR for your home equity -- 7% will earn you $35K, or about $3K/month. That's without drawing down the principle, and you can also amortize that over the 40 years if you like. However, if you aim for 7%, you may need to cover for the down years, as your risk will probably be higher. You could probably find something safer for, say, 4%, but that reduces your annual housing budget to $20K (or more, if you want to spend the principle down).
Of course, you could just add your house sale to your total assets, refigure your SWR, and figure what sounds like a sensible housing budget out of that income. Both are educated guesses, that are only as good as your research (estimating your retirement budget, income, etc.).