How long is a dissertation? Word limits by degree, from the regulations, and what the count includes

Dissertation word counts by degree

Undergraduate dissertations are usually 6,000 to 12,000 words, taught master's 10,000 to 20,000, research master's 15,000 to 50,000 and PhD theses 60,000 to 100,000, with Oslo's law faculty allowing more. Those ranges are not estimates: they are the spread of the limits below, each quoted from the university's own regulation and read on 4 November 2026.

The sources: Oxford History's Examination Conventions FHS 2026 (updated 3 March 2026); Nottingham's Quality Manual assessment equivalencies (version 1.1, September 2026); York's Health Sciences dissertation word limits; Warwick's Classics MA dissertation page (revised 29 September 2023); Cambridge's MPhil by thesis rules, PhD rules for physics and chemistry and PhD rules for earth sciences and geography; Newcastle's Rules for the Form of Theses 2026-27, rule 5; Oxford AMES's Submitting your Thesis; UWA's thesis word limitations; and Oslo Law's word limit.

Dissertation or thesis: the name does not tell you the length

"Dissertation" and "thesis" are used for different degrees in different places, so look up the limit for your degree and department rather than for the word. Oxford's History faculty calls its 12,000-word undergraduate piece a "thesis" and a paper in the same document an "Interdisciplinary Dissertation". Cambridge calls a 15,000-word MPhil piece a thesis. Cornell's Graduate School writes "thesis or dissertation" throughout its guidance and treats the two together.

The practical difference is between taught and research degrees. A taught degree's dissertation is one module among several and its length follows the module's credits. A research degree's thesis is the whole assessment, so its limit sits in the degree regulations and is usually a ceiling, not a target.

The same university can count differently

What the limit includes changes between departments, sometimes in the same document, so the number alone is not enough. The Cambridge Degree Committee page for physics and chemistry sets the same 60,000 words for both, but physics counts "summary/abstract, tables, footnotes and appendices" and chemistry counts the abstract, tables and footnotes while "excluding ... bibliography, appendices and acknowledgements". A physicist who moves 8,000 words of derivations into an appendix saves nothing; a chemist saves all 8,000.

The same committee's MPhil rule for physics goes the other way on footnotes and tables: 15,000 words "exclusive of tables, footnotes, bibliography, and appendices". So a physics student who took the MPhil and then the PhD in the same department would meet two definitions of a word limit.

Two widely repeated claims fail against these rules. Appendices are not always excluded: Cambridge Physics counts them, and so does Oxford's Asian and Middle Eastern Studies faculty, whose 100,000 words include "notes, glossary, appendices, etc.". And footnotes are counted more often than not in the regulations here; only Cambridge Geography, Cambridge's physics MPhil and UWA (for footnotes that only give references) leave them out. The wider comparison of footnote and citation rules, for essays as well as theses, is in the guide to whether the word count includes references.

Undergraduate dissertations: credits decide the length

In UK universities, an undergraduate dissertation's length follows its credit value: about 6,000 to 8,000 words for 30 credits and 8,000 to 10,000 for 40, in Nottingham's published scale. Nottingham's Quality Manual sets those figures for a "Final Year Dissertation/Project" and 10,000 to 15,000 words for 60 credits, against 2,500 to 4,000 words for an ordinary 20-credit coursework piece.

Other universities use their own scales, so treat the table as a way to read a module, not as a rule for yours. Oxford's History thesis is a fixed 12,000 words, footnotes included, for every student on the course. If your handbook gives credits but no word count, the credit value tells you roughly where in the 6,000 to 15,000 range you will land, and the handbook's own figure decides.

Master's dissertations: taught and research degrees differ

A taught master's dissertation is usually 10,000 to 20,000 words; a research master's thesis is two to five times that. York's Department of Health Sciences sets 10,000 words for its MSc and Master of Public Health dissertations, counting the main body "apart from tables and figures". Warwick's Classics MA asks for 15,000 to 20,000 words, footnotes included.

Research master's degrees sit between a taught dissertation and a PhD. Newcastle's 2026-27 rules allow an MPhil thesis of 50,000 words in humanities and social sciences and 40,000 in medicine, science, agriculture and engineering, notes included. UWA says "Master's theses may not exceed 50,000 words". Cambridge's physical sciences MPhil by thesis is much shorter, at 15,000.

The figure widely repeated online, "12,000 to 50,000 words" for a master's, is the whole of that spread. It is true of master's degrees as a group and tells you little about yours: a 10,000-word taught MSc and a 50,000-word MPhil are different pieces of work.

PhD theses: 80,000 or 100,000 is the usual ceiling

Most PhD regulations set a maximum of 80,000 or 100,000 words, and several tell candidates to aim lower. Newcastle's 2026-27 rules allow 100,000 words in humanities and social sciences and 80,000 in medicine, science, agriculture and engineering, "inclusive of notes, but excluding bibliography and appendices". Its integrated PhD programmes are shorter, at 80,000 and 50,000 words.

The ceiling is not the target. UWA says PhD theses "may not exceed 100,000 words but you are encouraged to prepare theses of no more than 80,000 words", and notes that some disciplines produce PhD theses under 25,000 words. Oxford's Asian and Middle Eastern Studies faculty, with the same 100,000 limit, "strongly encourages you to write no more than 80,000 words". Cambridge's physics and chemistry committee adds that "some of the best theses extend to only half this length". For a sense of scale, 80,000 words is inside the 50,000 to 130,000 that publishers post for adult novels, compared genre by genre in how many words are in a novel.

Law and some humanities subjects run longer. The University of Oslo's Faculty of Law says a PhD thesis "should normally consist of between 100 000 and 150 000 words", footnotes counted, and will not evaluate one of more than 200,000.

US dissertations: the committee decides

In the US, dissertation length is often left to the student's committee rather than set by the graduate school. Cornell's Graduate School says it "sets the minimum format for your thesis or dissertation", while "you, your special committee, and your advisor/chair decide upon the content and length" (Cornell Graduate School). Departments may still set one: Harvard's South Asian Studies PhD says "The dissertation should not exceed 75,000 words or 300 pages in length" (Harvard South Asian Studies).

US dissertations are usually described in pages. An analysis by Marcus Beck of 2,536 University of Minnesota dissertations completed from 2007, scraped from the university's repository, found lengths from 21 to 2,002 pages, with most around 100 to 200, and the longest medians in anthropology, history and political science and the shortest in economics, mathematics and biostatistics (Beck, 2013). It is one university and an older sample, so read it as a pattern, not a norm.

Page limits in words: two worked examples

A page limit holds a different number of words depending on font, spacing and paper, so convert it before you compare it with a word limit. The figures below use the site's words per page calculator for 12-point Times New Roman with 1-inch (2.54 cm) margins: 328 words a page double-spaced on US Letter, and 454 a page at one-and-a-half spacing on A4.

Example 1: Cambridge Earth Sciences, 225 pages of text

Cambridge's Department of Earth Sciences sets a page limit, not a word limit: no more than 275 numbered pages, "of which not more than 225 pages are text, appendices, illustrations and bibliography", and "A page of text is A4 one-and-a-half-spaced normal size type".

1. 225 pages × 454 words a page = 102,150 words, if every page were running text.
2. Figures, the bibliography and appendices share those pages. A thesis with 40 pages of figures and 25 of references has 160 pages left for text: 160 × 454 = 72,640 words.

So the page limit lands close to the 80,000 to 100,000-word limits elsewhere, but only after the figures and references are paid for.

Example 2: Harvard South Asian Studies, 75,000 words or 300 pages

1. 300 pages × 328 words a page, double-spaced on Letter = 98,400 words.
2. 75,000 words ÷ 328 = about 229 pages.

The two limits do not match. A double-spaced text reaches 75,000 words at about 229 pages, long before the 300-page cap, so the word figure is the binding one unless the thesis is heavy with figures and tables. When a rule gives both, check which you meet first.

Going over the limit: what each regulation says

For a PhD, an over-length thesis may be returned unexamined; for taught work, marks are deducted on a published scale. Cambridge's physical sciences committees say "a thesis that exceeds the limit may not be examined until its length complies with the prescribed limit", unless approval was obtained beforehand. UWA asks for a letter from the Head of School explaining a thesis over 100,000 words, and Oxford's Asian and Middle Eastern Studies faculty forbids submitting an over-length thesis with instructions to read only selected chapters.

Taught programmes publish tariffs. Oxford History's FHS 2026 conventions deduct marks by the percentage over the limit, up to a maximum of 10.

For the 12,000-word History thesis, 5% is 600 words. A thesis of 12,550 words is 4.6% over and loses 1 mark; one of 12,700 words is 5.8% over and loses 2. Cutting 100 words, to 12,600, saves a mark. Warwick Classics uses a different scale: "a deduction of 3% from mark per 1,000 words over/under the word-limit", applied below 14,000 or above 21,000 words.

Checking your dissertation against the limit

Count only what your regulation counts, then compare with the limit and any tolerance written in the same document. In practice that means four numbers: the body from the first word of the introduction to the last of the conclusion, the footnotes, the appendices and the tables. Add the ones your rule includes.

A worked example under Newcastle's humanities PhD rule (notes counted, bibliography and appendices not): a 106,000-word document with a 9,800-word bibliography and 6,200 words of appendices has 106,000 − 9,800 − 6,200 = 90,000 counted words, 10,000 under the 100,000 limit, provided the footnotes were in the 106,000. The same rules require a preface abstract of up to 300 words and do not say whether the title page or contents count, so ask the faculty before leaving them out. Word includes them only when "Include textboxes, footnotes and endnotes" is ticked, and Google Docs leaves them out; the step-by-step method for each is in counting only the body.

Counters also disagree on some words, such as hyphenated terms, dates and web addresses, which matters in a long thesis close to its limit; writing to a hard limit covers how to allow for it. The thesis abstract has its own, much smaller limit, compared in how long an abstract is.

Simple Online Counter is a free, browser-based set of counters, and its word counter opens a .docx on your device and counts the body text, headings, lists and tables but not the footnotes, so you can count the body and the footnotes separately and add them as your rule says.

What this guide covers

This guide quotes the regulations named above, as published on 4 November 2026, to show the range of dissertation and thesis lengths and how differently they are counted. It is not a substitute for your own: limits change between years and departments, and the rule that applies to you is the one in your programme handbook or degree regulations for the year you submit. Where your handbook is silent on a part of the thesis, ask your supervisor or the degree committee in writing.

It does not cover how long each chapter of a dissertation should be, which universities rarely regulate, or journal and conference word limits, which belong to the publisher.