PhD Dropout Rate: What the Data Says

Attrition by Field

Roughly 40 to 50 percent of all doctoral students in the United States do not finish their programs. The national 10-year completion rate is approximately 56 percent, meaning nearly half of all PhD entrants leave without a degree. Attrition is highest in humanities and arts programs (43 to 60 percent), followed by social sciences (40 to 50 percent) and STEM fields (30 to 40 percent). First-generation doctoral students face additional systemic barriers — weaker institutional networks, greater financial obligations, and less familiarity with the unwritten rules of academic culture — that contribute to higher-than-average attrition rates.

For more context on how PhD programs differ and how to choose the right one, see our comparison of PhD vs. master’s degree and our guide to understanding imposter syndrome in graduate school, which contributes significantly to attrition among first-gen students.

Frequently Asked Questions

What is the PhD dropout rate?

Across all fields, approximately 40 to 50 percent of doctoral students who begin PhD programs in the United States do not complete them. The national 10-year completion rate for all doctoral students is approximately 56 percent. Completion rates vary substantially by field, institution quality, and advisor support.

Which PhD programs have the highest dropout rates?

Humanities and arts doctoral programs have the highest attrition rates, with some studies showing 43 to 60 percent of students not completing their degrees. Social science programs follow at roughly 40 to 50 percent attrition. STEM programs have the lowest attrition at 30 to 40 percent, in part because strong funding, clearer research milestones, and structured lab environments reduce isolation and financial stress.

Why do PhD students drop out?

The most common reasons include a poor relationship with their dissertation advisor, financial stress from inadequate stipends, isolation and lack of peer community, mental health challenges, unclear milestones, loss of interest in the original research topic, and external life circumstances including family obligations or attractive alternative employment. For first-generation students, lack of institutional belonging and unfamiliarity with navigating academic systems add additional risk.

When do most PhD students drop out?

Attrition clusters at two critical transition points. The first is the transition from coursework to independent research, typically in years two and three. The second is during the dissertation writing phase itself, when external accountability decreases dramatically. Students who reach the dissertation stage after successfully completing qualifying exams still leave at meaningful rates — sometimes called ABD attrition (All But Dissertation).

What is the PhD dropout rate for first-generation students?

First-generation doctoral students leave PhD programs at higher rates than their continuing-generation peers. Studies point to advisor relationships, financial stress, imposter syndrome, and lack of social capital as the primary drivers of differential attrition. First-gen students are also more likely to have financial obligations to family that compete with the demands of graduate school.

How can I improve my chances of finishing a PhD?

The evidence-based interventions that most reliably improve PhD completion include choosing an advisor carefully before committing to a program (advisor fit is the single strongest predictor of completion), securing full funding with a livable stipend, maintaining active peer relationships, setting structured intermediate milestones with your advisor, seeking mental health support early, and connecting with organizations like Leadership Brainery that provide mentorship and community specifically for first-generation graduate students.