A dissertation is usually a long, book‑like research project, but the exact length depends on your level of study, subject, and university rules. In practice, most fall into fairly predictable word‑count ranges rather than one fixed number.

Typical lengths by degree

  • Undergraduate (bachelor’s)
    • Common range: about 8,000–15,000 words.
* Roughly 30–60 pages, depending on formatting and how many tables/figures you use.
  • Master’s
    • Common range: roughly 12,000–25,000+ words, with many programs sitting somewhere around 15,000–20,000 words.
* Often around 65–80 pages, though some disciplines or universities allow longer projects up to 40,000–50,000 words.
  • PhD / Doctoral
    • Often “book‑length”: typically about 70,000–100,000 words.
* This commonly works out to roughly 200–300+ pages, with humanities and social sciences often longer than STEM fields.

Differences by subject

  • STEM fields (science, tech, engineering, math)
    • Tend to be shorter in words than humanities but dense with data, figures, and experiments.
* Typical PhD range around 50,000–80,000 words or roughly 150–250 pages.
  • Humanities and social sciences
    • Often have longer literature reviews and more theoretical discussion.
* PhD dissertations frequently reach 80,000–100,000+ words and can run from ~200 up to 300–400 pages in some cases.
  • Creative and arts‑based fields
    • May combine a creative project (performance, portfolio, design work) with a shorter written component.
* The written part can be as low as 10,000–40,000 words, plus documentation of the creative work.

Timeframe: how long it takes

When people ask “how long is a dissertation,” they often also mean “how long does it take to do it.”

  • Bachelor’s and master’s dissertations often occupy most of the final year, worked on alongside other modules.
  • PhD dissertations usually take several years of research and writing, with the writing phase alone often stretching over many months to a year or more.

Real‑world forum chatter

On student forums and Reddit, people often compare page counts and timelines rather than strict word counts.

  • You will see everything from “finished 10,000 words in a week” for undergrad projects to debates over whether a 100‑page PhD is “too short.”
  • A common theme: a clear, tightly argued dissertation that meets the criteria is valued more than sheer length.

Practical takeaway

  • Check your department or program handbook first: local rules always overrule generic ranges.
  • Aim for the middle of the recommended band, then adjust based on feedback from your supervisor.
  • Focus less on “how long is a dissertation” and more on “does this length let me answer my research question clearly and convincingly.”

Meta description (for SEO):
Wondering how long is a dissertation? Learn typical word counts and page ranges for undergraduate, master’s, and PhD dissertations across STEM, humanities, and creative fields, plus real‑world forum insights.

Information gathered from public forums or data available on the internet and portrayed here.