How to Write a Thesis Statement

What is a thesis statement?

A thesis statement is the sentence, sometimes two, that tells your reader exactly what your essay will argue. In most academic essays it sits at the end of the introduction, so the reader meets the claim before the evidence. Everything after it — each body paragraph, each quotation, each counterargument — exists to prove, qualify or defend that sentence. If a paragraph does none of those things, it belongs in a different essay.

A topic is not a thesis: “social media and teenagers” names an area but makes no claim. A fact is not a thesis either: “social media platforms use recommendation algorithms” can be checked, so there is nothing left to argue. A thesis takes a position a reasonable reader could dispute: “Schools should teach how recommendation feeds work, because students cannot judge what they are shown without knowing why they are shown it.”

Subjects name it differently — the argument in history, the hypothesis or aim in a lab report, the position in philosophy — but the rule is the same everywhere: the reader should know early, in plain words, what you claim and roughly why.

What makes a strong thesis statement

Markers judge a thesis on the same handful of qualities whatever the subject. The one students most often misread is “arguable”, which does not mean controversial or loud. A careful claim about how a poem uses line breaks is just as arguable as one about a political issue, because another reader could interpret the line breaks differently.

The most persuasive academic theses are often qualified: they concede a limit with “although” and then claim something precise inside it. A qualified claim is easier to defend. Check your draft against each of these five qualities:

• Arguable: someone who read the same material could reasonably take a different view. If no one could disagree, you have written a summary.
• Specific: it names the case, period, text or group you are writing about, not the whole subject.
• Reasoned: it gives the main reason for the claim, often with “because” or “although”, so the reader can follow your logic.
• Supportable: you can prove it with evidence you actually have, inside the word count you actually have.
• Focused: it makes one main claim. Two unrelated claims usually means two essays fighting for the same space.

How to write a thesis statement in six steps

The running example uses a common history prompt: “Discuss the effects of the printing press in early modern Europe.”

Watch what happens between steps four and five. The blunt answer becomes specific (scholars, a period), comparative (uniformity rather than speed) and reasoned. The finished sentence also predicts the essay: what uniform copies meant, how scholars used them, and why speed mattered less. The steps:

1. 1Find the task word. “Discuss”, “evaluate”, “to what extent” and “compare” all ask for a judgment, not a description, so your thesis has to make one.
2. 2Turn the topic into a real question. “What effects did print have?” is too open; “Which effect of print mattered most to scholars, and why?” can be answered in one essay.
3. 3Read enough to answer it provisionally: your lecture notes and two or three key sources, looking for a pattern rather than every detail.
4. 4Write a blunt one-sentence answer without polishing it: “Print mattered most because copies were identical.”
5. 5Add the scope and the reason: “For European scholars after about 1450, print mattered less for the speed of copying than for its uniformity, since identical copies let readers in different cities cite, correct and argue over the same page.”
6. 6Check it against the prompt and your evidence. Does it answer the question asked? Can you name evidence for each part? If not, narrow the claim until you can.

Thesis statement examples for different essay types

A thesis does a slightly different job in each kind of essay. Use these models for shape, not wording. The expository row is the one place a thesis can look like a summary, yet it still commits you to three causes in a chosen order. For the argumentative type in full, see the guide to writing an argumentative essay.

Five common thesis problems, and how to fix them

Most weak theses fail in one of five predictable ways. Each has a quick repair.

Where the thesis statement goes, and how long it should be

In most essays written for US and UK courses, the thesis is the last sentence or two of the introduction. A short essay usually needs one sentence; a research paper may need two, the first making the claim and the second outlining how the argument proceeds. For what belongs around it, see the guides to writing an essay introduction and to overall essay structure.

Be wary of the “three-prong” thesis that lists the topics of three body paragraphs. It helps in a timed exam, where a marker wants your plan at a glance, but in a longer essay it tends to produce three disconnected mini-essays. State the claim and its reason instead, and let the reasoning set the order of sections. Some personal and inductive essays hold the thesis back on purpose; in coursework, put it up front unless told otherwise, because a marker who cannot find your claim will assume you lack one.

How to test and revise a working thesis

The thesis you write before drafting is a working thesis: a best guess that keeps the draft pointed in one direction. Writing changes your thinking, so plan to revise the thesis after the draft as well as before it.

Of the four tests below, the last, the match test, is the most useful and the most often skipped. Drafts wander toward a better argument than the one you planned, and the fix is often to promote the conclusion you reached into the thesis. To build the critic's sentence into the essay, give it a paragraph of its own and answer it; to check a whole draft against your plan, the guide to outlining an essay explains the reverse outline. Run all four once the full draft exists:

• The “so what?” test: if a reader would shrug, add the consequence — why the claim matters for the text, the period or the debate.
• The “how do you know?” test: list the evidence for each part of the claim. Any part with no evidence should go.
• The opposition test: write one sentence a thoughtful critic would say back. If you cannot, the claim may be too obvious to need an essay.
• The match test: read only your topic sentences in order. They should add up to the thesis; if they add up to something else, rewrite the thesis.