Gender Gap in STEM: Scope and CausesGender Gap in STEM: Scope and Causes
Despite decades of progress toward gender equity, women remain significantly underrepresented in STEM (science, technology, engineering, and mathematics) education and careers. This gap emerges early in childhood, widens during adolescence, continues throughout higher education, and persists in the workforce.
Scope of the Gender Gap
Women represent only 28% of the global STEM workforce and approximately 24% of the STEM workforce in the United States (MIT Professional Programs, 2023). The disparity is also evident in research careers. According to UNESCO, women account for only 28% of the world's researchers, limiting diversity in scientific discovery and innovation. Higher education reflects similar trends. Although women participate widely in higher education overall, they comprise only 35% of students enrolled in STEM degree programs. Representation is particularly low in:
Information and communication technology (ICT)
Engineering
Manufacturing and construction
Mathematics and statistics
Natural sciences
Furthermore, only about 30% of female higher education students choose STEM-related fields of study, and many women leave STEM disciplines at disproportionately high rates before completing their education. The gap continues into graduate education. Women receive only 38.8% of STEM bachelor's degrees, 37.6% of STEM master's degrees, and 35.9% of STEM doctoral degrees in the United States.
Causes of the Gender Gap
Early Gender Stereotypes: Research from the American Association of University Women (AAUW) indicates that gender stereotypes begin influencing children during elementary school. Girls are often exposed to messages suggesting that boys are naturally better at mathematics and science, which can reduce girls' confidence in their own abilities despite comparable academic performance. Girls also encounter relatively few female scientists and engineers represented in books, media, and popular culture. Representation is even more limited for Black and Latina women, reducing opportunities for students to identify with STEM role models.
Unequal Educational Opportunities: The gap widens during middle and high school. Girls are less frequently encouraged to enroll in advanced STEM courses such as physics, calculus, and computer science. These courses often serve as prerequisites for STEM majors in college. Students of color additionally face reduced access to Advanced Placement (AP) STEM coursework, creating another barrier to entering STEM pathways. UNESCO similarly notes that girls worldwide experience limited educational pathways into STEM, contributing to lower participation and achievement.
Social and Family Influences: Parental attitudes can significantly influence girls' interest in STEM. UNESCO reports that girls whose parents have higher socioeconomic status, are non-immigrants, and are not single parents tend to experience more positive attitudes toward STEM education. These supportive environments may encourage greater participation in STEM learning.
Biological Differences Do Not Explain the Gap: UNESCO emphasizes that current research does not support biological sex differences as the primary explanation for women's underrepresentation in STEM. Studies examining brain development, genetics, neuroscience, and hormones have found insufficient evidence that innate biological differences account for observed disparities. Instead, learning depends heavily on neuroplasticity—the brain's ability to form new neural connections through experience. STEM achievement is therefore influenced primarily by learning opportunities, encouragement, educational experiences, and environmental factors rather than biological sex.
Barriers During Higher Education: Women continue to face challenges after entering college. They remain underrepresented in engineering, computing, mathematics, and physical sciences while being more concentrated in health-related disciplines. Many women also leave STEM majors at disproportionately high rates before graduation, further reducing representation in the STEM workforce.
Workplace Challenges: Even after entering STEM careers, women encounter barriers that contribute to lower retention. According to AAUW, these include hostile or non-inclusive workplace climates, caregiving responsibilities, limited family-friendly workplace policies, and perceived penalties for using parental leave and support systems. These challenges disproportionately affect mothers and women of color, contributing to continued underrepresentation in STEM professions.
Reduced Institutional Support: AAUW also notes that recent anti-DEI policies have reduced access to programs designed to support women and other underrepresented groups in STEM.Examples include reductions in mentorship programs, title IX offices, STEM recruitment initiatives, equity-focused research funding, and science and technology training programs. These changes may reduce opportunities that help students persist in STEM education and careers.
Why Closing the Gap Matters
Increasing women's participation in STEM benefits both individuals and society. Women have already made major contributions to scientific and technological advancement, including research that has improved disease prevention, expanded understanding of brain development, advanced stem cell science, and contributed to treatments for illnesses such as cholera and cancer.
Greater representation can also improve economic outcomes. According to AAUW, STEM workers who majored in STEM earn approximately 1.15 times more than workers without STEM degrees. Expanding women's participation in STEM therefore has the potential to reduce the gender pay gap while strengthening innovation and economic growth.
