The amount you need to retire depends heavily on the age you stop working — a longer retirement needs a lower withdrawal rate and a bigger portfolio. Pick your target age for the worked number across spending levels, plus the 401(k) access, healthcare, and Social Security rules that apply at that age.
Retire at 50Nest-egg target + access rules
Retire at 55Nest-egg target + access rules
Retire at 60Nest-egg target + access rules
Retire at 62Nest-egg target + access rules
Retire at 65Nest-egg target + access rules
Retire at 67Nest-egg target + access rules
Retire at 70Nest-egg target + access rules