The YourLifeChoices quarterly reviews are quite a good starting point to work out where a retiree hopeful can work out in today’s money what they need to have to enjoy a picked lifestyle.
May 2021 figures
which can be compared to Feb 2021 figures
They also usually include a fill in chart so you can compare your spending to each section
In the Feb 2021 issue there are a series of articles on why many people underestimate their financial needs for retirement starting on page 8