Two numbers describe the same set of retirement accounts. The average balance is $148,153. The median is $38,176. Both come from Vanguard's How America Saves report, which covers roughly 5 million defined contribution participants across more than 1,400 plans, as reported by Yahoo Finance.
The average is 3.9 times the median. That ratio is the story.
What the two numbers actually measure
The median is the middle. Line every participant up by balance and the person standing in the centre has $38,176. Half have less.
The average is the total divided by the number of people. It is pulled upward by anyone with a very large balance, and a small number of long-tenured, high-income savers is enough to move it a long way. As the report's framing puts it, that group pulls the average far above where the middle actually sits.
Neither number is wrong. They answer different questions. If you want to know how much money sits in these plans in total, which matters to the firms administering them, use the average. If you want to know how you compare to a typical saver, the average is actively misleading and the median is the one to use.
A gap of nearly four times is unusually wide, and it is a measurement of inequality within the group, not of how much anyone needs.
Who is missing from the data
The more important limitation is not statistical but definitional.
This dataset counts people who have a 401(k) with one provider. It cannot see anyone with no workplace plan at all, anyone eligible who never enrolled, or anyone whose savings sit elsewhere. Those absences all point the same way: the people missing from the sample are, on average, worse prepared than the people in it.
So $38,176 is the middle of a group that already clears a meaningful bar, namely having a job that offers a plan and having joined it. The middle of all American workers would be lower.
What a single balance does not tell you
The opposite caution applies to reading any one figure as a verdict on a household.
A 401(k) is one account. The same household may hold an IRA, a spouse's plan, home equity, a pension from an earlier employer, or taxable savings. Social Security will also replace a meaningful share of pre-retirement income for most people, and it is inflation-linked and lasts for life, which no account balance does.
Balances also rise sharply with age, for the obvious reason that they have had longer to accumulate. A figure that includes 25-year-olds who started last year alongside 60-year-olds who have contributed for three decades is not describing a typical retirement saver; it is averaging across entire careers.
Fidelity, which publishes a separate dataset covering its own participants, has reported balances rising steeply by age band, and the two providers' numbers are not directly comparable because the populations differ.
The useful way to read this
If the point of the exercise is to work out where you stand, three adjustments make the comparison honest.
Compare against the median rather than the average, and against your own age band rather than the whole population. Count all your retirement accounts, not just the current employer's plan. And treat the result as a starting point for the question that actually matters, which is what income those assets plus Social Security would produce, rather than whether the balance looks impressive.
The headline gap is worth keeping in mind for a different reason. Whenever a statistic about wealth or income is quoted as an average, and the distribution is skewed, the average will describe almost nobody. That is true of house prices, salaries and savings alike. Asking for the median is usually the fastest way to find out whether a number means anything.
