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A college education can be a costly undertaking. College Board data shows that four-year college students spent around $35,000 a year in tuition, housing, and other expenses at private nonprofit institutions and $20,000 at public ones, taking into account grants and financial aid. Although those numbers are much lower than the $60,000 per year price tag that private nonprofit colleges typically post, it still amounts to a lot of money.

However, because of the daunting cost (not to mention potentially differing politics and beliefs), more and more people are second-guessing the value of postsecondary education. In a 2024 Gallup and Lumina Foundation poll, only 36% of adults said they have a "great deal" or "quite a lot of" confidence in higher education—a dip from 2015, when 57% expressed this confidence.

Despite these hesitations, people continue to see college as a pathway to success. Among the Gallup respondents who expressed higher confidence levels, nearly a quarter said it was because postsecondary education fosters better opportunities.

Data supports this sentiment: College graduates tend to make much more money than their less-credentialed counterparts. According to the Bureau of Labor Statistics, Americans aged 25 and over with bachelor's degrees had a median income of around $1,493 a week in 2023, 66% more than their peers with just a high school diploma.

Looking at this wage gap alone can provide a misleading picture of a college education's impact on a person's earnings. As economist and author Bryan Caplan of George Mason University points out in his book "The Case Against Education: Why the Education System Is a Waste of Time and Money," not everyone who goes to college graduates. He estimates that for students who enrolled in college in 2007, only 4 in 5 (82%) people who go to a public four-year college had a bachelor's degree six years after enrollment and that most fail to graduate on time. Estimates of the benefits of college also often ignore the opportunity cost: Every minute spent studying is a minute spent not working.

One way to reconcile these facts would be to evaluate college degrees as financial investments. Learner analyzed data from the General Social Survey and Census Bureau via the University of Minnesota IPUMS, the Tax Foundation, and other sources to estimate the return on investment for a college education.

College is still a good bet, but only for some

When companies or investors consider a project, they care about the internal rate of return, or IRR, a form of ROI. Investing in a project with a 5% internal rate of return is financially equivalent to putting your money in a savings account that pays 5% interest a year.

Stacker has built a statistical model that estimates how much people of different academic abilities and education levels can expect to earn and estimates the internal rates of return on pursuing a four-year degree. It considers the sum of all personal-level income, such as wages, bonuses, tips, rental income, and more. Borrowing from Bryan Caplan's aforementioned book, this analysis breaks students into four levels of academic ability, ranging from "excellent students," who have grades and test scores at roughly the 82nd percentile on tests, to "poor students," who are at roughly the 24th percentile of academic performance.

This model makes several simplifying assumptions. It assumes everyone who goes to a four-year college does so between 18 and 21, and anyone who drops out does so after two years. It also assumes full-time college students do not work and that everyone files taxes as single persons with no dependents and takes the standard tax deductions. It ignores the impact of state and local taxes, as well as living expenses, since people who do not go to college need housing too. Students who can live at home during college save a lot of money.

Overall, this analysis finds that college is a good bet, at least for those with a good academic record. Excellent students can expect an ROI of about 14.1% at public four-year colleges, while poor students can expect only a 4.6% return. For comparison, the S&P 500 Index, which tracks the performance of shares in the biggest listed companies in America, has provided a total return of around 10% a year over the past three decades.

The biggest reason some students can expect much better returns than others is graduation rates. Drawing from Caplan's research, this model assumes excellent students have a 66.5% chance of graduating with a bachelor's degree, while poor students have only a 6.1% chance.

These numbers also do not account for inflation, which would lower the expected returns on investment by two to three percentage points.

Better to have studied than not at all

Considering not everyone who enters college gets a degree, would even an attempt at graduating make a difference? Yes, says a different analysis by Stacker using GSS data, which incorporates educational background and a measure of academic ability in the form of a miniature vocabulary quiz called Wordsum. Even when college students drop out, it is likely they will earn more than their peers who never went at all.

Part of what colleges do is filter for people who are already bright. By including a measure of academic ability, this analysis limits the credit given to colleges for the earnings of their future graduates. It also helps account for the fact that people with high academic ability tend to have better career options than those who don't, regardless of what diplomas they might hold.

GSS data shows that both the educational credentials a person has and their academic fitness—as measured by a short vocabulary quiz—matter when it comes to earnings. For example, a person who scored a 5 out of 10 on the Wordsum quiz can be expected to have a family income of around $65,000 a year if they graduated from high school but never went to college, $69,000 if they went to college but did not graduate, and $105,000 if they earned a bachelor's degree.

The fact that college graduates earn so much more than their peers who dropped out, even controlling for academic ability (as measured by Wordsum), could be partly because they are above average on some traits outside of those measured by the data. It also suggests employers value college degrees. To paraphrase Bryan Caplan, a high schooler who goes on to earn a bachelor's degree in underwater basket weaving will likely earn much more money than their equally intelligent peers who never went to college. Graduating is the hard part.

One of the biggest barriers to higher education (and, consequently, graduation) is the cost.

An October 2021 Pew Research Center survey found that roughly 3 in 5 U.S. adults do not have four-year college degrees mainly because they couldn't afford them. Another major reason was that they needed to work and support their families instead of finishing their education. One way some students have navigated this has been by applying to multiple colleges—some are more generous with their financial aid packages than others. This analysis, however, assumes students on average are paying the same as their peers. Anyone who pays full price for a four-year degree at a private college will have a much harder time getting a positive financial return on their tuition.

One's field of study also matters. While this analysis doesn't break college graduates by their majors, a recent study with a similar methodology by Liang Zhang of New York University and two other scholars does. In general, Zhang's study found that engineering and computer science majors produce the best rates of return, exceeding 13%. Business, health, math, and science degrees followed with IRRs between 10% to 13%. Behind them are degrees in biology and social science, which typically return between 8% and 9%. Education and humanities produced the lowest IRRs, especially for men. However, their numbers are adjusted for inflation and do not factor in dropout rates.