Engineering education researchers at Ohio State University studied 229 first-year engineering students moving through a common first-year program with fourteen available majors. Mechanical engineering started the year with the highest enrollment of any discipline. One in four of those students switched out before the year ended. The researchers described the pattern in a single sentence: "mechanical engineering is sometimes viewed as a 'default' major by undecided engineering students" (Theiss, Robertson, Kajfez, Kecskemety, & Meyers, 2016). That is not a Reddit comment. That is a peer-reviewed finding published by engineering faculty who watched it happen in their own hallways. See Reason #1 for what happens when tens of thousands of people make that same safe choice every year.
The mechanism is not mysterious. ME departments market breadth. "You can work in any industry." "It keeps your options open." That pitch targets one audience: students who have not decided yet. At most large engineering schools, ME sits at or near the floor for internal admission requirements. At Ohio State, mechanical engineering requires a 2.0 cumulative GPA to declare. Biomedical engineering requires a 3.5 and caps enrollment at 75 students per year (Ohio State University College of Engineering, 2023). Hundreds of pre-BME students cannot get in each year and have to go somewhere else. The students who transferred into ME during that same study period told researchers they chose it because it was the "jack of all trades" with the most career versatility (Theiss et al., 2016; Kecskemety & Kajfez, as cited in Theiss et al., 2016). That is not passion for thermodynamics. That is the language of someone whose first door closed. See Reason #8.
The enrollment data confirms it at national scale. From 2009 to 2020, U.S. colleges more than doubled the number of mechanical engineering degrees they awarded, from 18,498 to 37,353, while BLS projections across four cycles between 2012 and 2024 clustered between 19,200 and 21,200 annual openings (NCES, 2022; BLS, 2024). That single-discipline increase of 18,855 graduates per year is larger than the entire graduating class of civil engineering, larger than all of electrical engineering, and larger than all of chemical engineering. Civil grew 33 percent over the same period. Electrical grew 23 percent. ME grew 102 percent (NCES, 2022). Passion for fluid mechanics did not double in a decade. General interest in engineering doubled, and ME absorbed it.
MIDFIELD, a longitudinal database tracking 1.7 million students across 33 universities, measures what happens next. ME's within-engineering transfer ratio is 0.70, meaning for every student who switches into ME from another engineering discipline, 1.43 switch out (Vick, Strawderman, & Smith, 2023). ME is not a destination. It is a revolving door. MIDFIELD shows ME as a net sender rather than a net receiver within engineering, a high-churn hub rather than a quiet corner, which is exactly what a revolving default looks like once students discover the actual work. See Reason #35. But the intake is so massive that the survivors still outnumber every other discipline's entire graduating class. ME's share of all engineering degrees peaked at 25.8 percent in 2018 and fell to 22.2 percent by 2023, while computer science inside engineering rose from 14.0 to 19.6 percent over the same window (ASEE, 2018-2024). One curve is boom-and-bust. The other is a secular climb. The boom-and-bust shape is what a default absorber looks like from above.
You are what is left after the revolving door finishes turning. You stayed while others found exits into CS, industrial engineering, or out of engineering entirely. Now you face the arithmetic. ME produces roughly 29,800 bachelor's degrees a year, the single largest engineering discipline, into a market with 18,100 annual openings, 86 percent of which are replacements for people who retired or left, not new positions (ASEE, 2024; BLS, 2024). The supply ratio is 2.5 to 1. See Reason #34. One million people hold ME degrees in the United States. Only 293,100 work as mechanical engineers (NSF, 2023; BLS, 2024). The Federal Reserve Bank of New York puts early-career ME underemployment at 20.1 percent, the worst among the major engineering branches (NY Fed, 2026). The NSF's National Survey of College Graduates finds ME degree holders report the lowest share of "very satisfied" (41.2 percent) and the highest share of dissatisfaction (9.5 percent) of any named engineering discipline (NSF, 2023). See Reason #67.
Other engineering disciplines self-select. Electrical students pick power or signals or embedded because the curriculum forces a direction early. Chemical students aim for process or pharma because the industry is narrow enough to demand it. Computer science students chose a field where demand outpaces supply and the share of engineering degrees is still climbing. You chose the one that sounded safest. It produced the largest graduating class, the worst underemployment, the lowest satisfaction, and a million-person reservoir competing for fewer than three hundred thousand seats. The "default" was not a neutral choice. It was the most expensive one available.
You kept your options open. The market closed them for you.
References:
American Society for Engineering Education. (2018-2024). Engineering and engineering technology by the numbers, annual editions. https://ira.asee.org/by-the-numbers/
Bureau of Labor Statistics. (2024). Mechanical engineers. Occupational Outlook Handbook. https://www.bls.gov/ooh/architecture-and-engineering/mechanical-engineers.htm
Federal Reserve Bank of New York. (2026). The labor market for recent college graduates. https://www.newyorkfed.org/research/college-labor-market
National Center for Education Statistics. (2022). Table 325.47: Degrees in chemical, civil, electrical, and mechanical engineering conferred by postsecondary institutions. Digest of Education Statistics. https://nces.ed.gov/programs/digest/d22/tables/dt22_325.47.asp
National Science Foundation. (2023). National Survey of College Graduates, 2021 (NSF 23-306). https://ncses.nsf.gov/pubs/nsf23306
Ohio State University College of Engineering. (2023). Admission to major update, 2022-23. https://oaa.osu.edu/sites/default/files/uploads/caa/meetings/2022-23/03-01-2023/COE%20Admission%20to%20Major%20Update%202022-23.pdf
Theiss, K. L., Robertson, B. F., Kajfez, R. L., Kecskemety, K. M., & Meyers, K. L. (2016). Engineering major selection: An examination of initial choice and switching throughout the first year. ASEE Annual Conference & Exposition Proceedings. https://peer.asee.org/engineering-major-selection-an-examination-of-initial-choice-and-switching-throughout-the-first-year.pdf
Vick, S. M., Strawderman, L., & Smith, B. (2023). Transfer paths into and out of industrial engineering. ASEE Annual Conference & Exposition Proceedings. https://peer.asee.org/transfer-paths-into-and-out-of-industrial-engineering.pdf
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