Get a rule-of-thumb target for how much to have saved by retirement. Enter the income you want in retirement, subtract guaranteed income (Social Security, pensions), and use a withdrawal rate (e.g. 4%) to see the nest egg you’re aiming for.
Many planners use the 4% rule: in year one of retirement you withdraw 4% of your portfolio; in later years you adjust for inflation. So: nest egg ≈ annual income from portfolio ÷ 4%. This calculator does that math for you. You can change the withdrawal rate (e.g. 3% for a more conservative target).
Once you have a target, use the 401(k) / IRA On Track? calculator to see if your current savings and contributions are on pace to reach it.