Thesis statement examples: 60 strong theses by essay type and field

A thesis statement is the sentence, or pair of sentences, that states the main claim of an essay: what you will argue, explain or show, and usually why. In most academic essays it comes at the end of the introduction, and every body paragraph exists to support it. A strong thesis is arguable, specific and small enough to defend in the length you have.

This page is a collection of finished theses to compare your draft against. It starts with 12 weak theses rewritten into strong ones, each with a note on what the rewrite gives a reader to dispute. Then come the 60 examples, all original, grouped by the type of essay and then by academic field, plus patterns you can adapt and a checklist. Use the examples to see the shape of a good thesis, not as sentences to borrow: a thesis only works if it says what your evidence shows.

What makes a thesis statement strong

A thesis is a promise. It tells the reader what the essay will prove, and the reader holds you to it. Three qualities decide whether you can keep the promise:

• It is arguable. A reasonable reader could disagree, or at least ask “how?” or “why?”. “Bread contains gluten” is a fact. “Bread rises because gluten traps the gas yeast gives off” is an explanation someone has to follow. “Schools should bake bread in science class” is an argument.
• It is specific. It names a particular subject, time, place, text or group, and uses exact words where vague ones would be easier. “Social problems” and “has an impact” are signs the thesis isn't finished.
• It is sized to the evidence. A five-page essay can prove that one policy failed in one city. It can't prove that a whole century went wrong. Limiting words such as “in rural districts”, “after 1950” or “more than” make a claim defensible.

Many strong theses also combine three parts, though not always in this order: the claim (what you assert), the reasons or route (the “because”, which previews the body), and the stakes (why the claim matters, or what follows from it). You will see all three in many of the examples below. A short essay can leave the stakes for the next sentence of the introduction.

Weak thesis statements, rewritten

Most weak theses fail in one of a few ways: they state a fact, announce a topic, list both sides, or stay too general to prove. Here are twelve weak versions, what is wrong with each, what the rewrite gives a reader to dispute, and the rewrite itself.

Notice what the rewrites have in common. Each one names something you could look up or point to (flood maps, mobilization plans, a repeated word, an entry fee), and each one could be wrong, which is what makes it worth an essay. The argumentative essay examples show full essays built on theses like these, and the persuasive essay examples show the gentler version written for a general reader.

Thesis statement examples by essay type

Each group ends with a note on what one example in it does, so you can test your own draft the same way.

Argumentative thesis statement examples

An argumentative thesis takes a side on a question people really disagree about and gives the main reason. Numbers 5 and 6 argue the same question from opposite sides: either side can carry a strong essay, as long as the thesis commits.

1. The United States should stop changing its clocks twice a year and stay on standard time all year, because standard time keeps winter mornings light and sits closer to the body's natural daily rhythm than permanent daylight saving time would.
2. Public libraries should lend tools as well as books, because a drill that a household uses for ten minutes a year is a better candidate for sharing than almost anything on the shelves.
3. Universities should print the median debt of each program's graduates on the program's own web page, because applicants compare programs on cost only when the cost is in front of them.
4. Cities that want fewer cars downtown should make buses free before they build new rail lines, because fares slow boarding and discourage short trips, and dropping them costs far less than construction.
5. Selective colleges should require standardized test scores again, because scores help admissions officers spot strong students from high schools that offer few advanced courses.
6. Selective colleges should keep test scores optional, because a single Saturday morning measures access to test preparation as much as it measures readiness for college.
7. Restaurants should have to post their health inspection grade in the front window, because a letter on the door turns a report nobody reads into information diners act on.

What number 3 does: it names who should act (universities), the exact action (print one number on one page) and a reason about behavior that sources can test. A vaguer version, “College should be more transparent about cost”, gives the essay nothing to prove.

Analytical thesis statement examples

An analytical thesis breaks something into parts (a speech, an image, a system, a text) and claims what those parts add up to.

8. Abraham Lincoln's Gettysburg Address persuades through time rather than argument: it opens 87 years in the past, closes on a “new birth of freedom” in the future, and places the cemetery in the present between them.
9. Grocery stores are laid out to make shoppers walk: by putting milk, eggs and bread at the back, they turn a two-item errand into a tour past everything else they sell.
10. Edward Hopper's Nighthawks (1942) is a painting about distance more than loneliness: the diner has no visible door, so the viewer, like the people inside, is close enough to see in and too far to enter.
11. Wikipedia's “citation needed” tag works as a teaching tool as much as an editorial one: by marking what is missing, it trains readers to doubt any claim that arrives without a source.

What number 10 does: it starts from a detail anyone can check in the painting, then makes an interpretation that needs defending. The essay can spend one section on the window, one on the street and one on the viewer's position.

Expository thesis statement examples

An expository essay explains rather than argues, but its thesis still commits: it says how something works or what its parts are, and the body follows that order.

12. Bread rises because yeast feeds on sugars in the flour and gives off carbon dioxide, and gluten, the stretchy network of proteins formed by kneading, traps that gas in the dough.
13. A bill becomes federal law in the United States after it passes the House and the Senate in identical form and the president signs it, leaves it unsigned for ten days (Sundays excepted) while Congress is in session, or has a veto overridden by two-thirds of both chambers.
14. Noise-canceling headphones work by sampling the sound around the listener and playing back its mirror image, so the two waves cancel each other before they reach the ear.
15. A FICO credit score is built from five kinds of information, weighted differently: payment history, amounts owed, length of credit history, new credit and the mix of credit types.

What number 15 does: it promises five sections in a fixed order, and “weighted differently” tells the reader that the essay will also explain which part counts most.

Compare-and-contrast thesis statement examples

A comparison needs a reason to exist. The thesis says what you learn from putting two things side by side that you couldn't learn from either alone.

16. Although Frankenstein and Dracula both set science against the supernatural, Shelley's novel fears what science can make, while Stoker's enlists it, with typewriters, blood transfusions and train timetables, against an older evil.
17. Remote and office work differ less in how much gets done than in what each makes visible: offices display effort, remote work displays only results, which is why managers and employees can judge the same week so differently.
18. Elizabeth Bennet and Emma Woodhouse both misjudge the people around them, but Elizabeth's errors come from pride in her own judgment, while Emma's come from having too little else to do.
19. The haiku and the sonnet are both built around a turn, but the haiku sets two images side by side and leaves the connection to the reader, while the sonnet argues its way to the turn and explains it.

What number 18 does: it picks one shared trait (misjudging people) and locates the difference in its cause. That gives the essay a clear plan: one section per heroine, then a section on what the difference says about each novel.

Cause-and-effect thesis statement examples

A cause-and-effect thesis names the mechanism, the “because”, not just two events that happened in order.

20. When a town loses its local newspaper, its government is watched less closely, and one measurable result is that the town tends to pay more to borrow money.
21. Air conditioning changed American politics as much as American comfort, because after the 1950s it made the hot Sun Belt livable for millions of new residents, and their votes moved with them.
22. Streaming has made pop songs shorter: because services count a play after about thirty seconds, songs that reach the chorus quickly and end before listeners drift away earn more.
23. The Dust Bowl of the 1930s was caused as much by farming as by drought: years of deep plowing had removed the native grasses that once held the Great Plains soil in place.

What number 23 does: “as much by farming as by drought” is a limited claim. It doesn't deny the drought, which would be easy to refute; it argues for a second cause, which the essay can support with what farmers did in the decades before.

Literary analysis thesis statement examples

A literary thesis makes a claim about how the text works: its structure, its narrator, an image, a pattern. Summary of the plot is not a thesis, however well written.

24. In Frankenstein, Mary Shelley gives the creature the most eloquent voice in the novel, so that the real horror of the story is not his violence but Victor's refusal to listen to him.
25. In The Great Gatsby, Nick Carraway's claim that he is “inclined to reserve all judgments” is the novel's first unreliable statement: he judges everyone, and the reader learns to read him as closely as he reads Gatsby.
26. In “The Yellow Wallpaper,” Charlotte Perkins Gilman turns the rest cure's ban on writing into the story's form: every entry the narrator hides from her husband is an act of the resistance her treatment forbids.
27. In Romeo and Juliet, haste is the real villain: nearly every disaster in the play follows a decision made too fast, as Friar Laurence warns in Act 2 when he says “they stumble that run fast.”
28. In “The Tell-Tale Heart,” Poe makes the narrator's insistence on his sanity the main evidence of his madness: the more carefully he explains himself, the less the reader believes him.

What number 25 does: it starts from a quoted line and argues that it means the opposite of what it says, a claim the essay can test scene by scene. The glossary entry on the unreliable narrator covers the device it relies on.

Research paper thesis statement examples

A research thesis answers your research question with a claim your sources can test. It often comes later in the introduction, after you have shown what others have found.

29. Rural districts that move to a four-day school week save less money than they expect, because transportation and building costs fall but salaries, the largest part of a school budget, do not.
30. Street trees cool sidewalks more than cool roofs do at pedestrian height, so cities that want to protect people walking in heat waves should plant trees before they paint roofs.
31. Language-learning apps build vocabulary quickly in the first months but lag behind classroom study in speaking, because they reward recognizing words more than producing them.
32. Self-checkout has moved grocery workers more than it has replaced them: stores have shifted staff from registers to restocking, online orders and loss prevention.
33. Wildfire smoke now makes up a growing share of fine-particle pollution in the western United States, which makes air quality rules aimed at cars and factories less effective there than they used to be.

What number 29 does: it could be checked against real district budgets, and the body would show the numbers. If you are still choosing a question, the list of research paper topics and the research question examples come first; the thesis is the answer you find.

Personal and narrative essay thesis examples

A personal essay's thesis is an insight rather than an argument, and it can sit at the end of the opening scene instead of the first paragraph. It still has to be specific.

34. Working night shifts at my uncle's bakery taught me that patience is not waiting but doing the same small task correctly four hundred times in a row.
35. Moving to a country where I could not read the street signs made me a better listener, because for six months listening was the only way I could find anything.
36. My grandmother's recipe cards, written in three languages over fifty years, tell the story of our family's migration more honestly than any of us ever has out loud.

What number 34 does: “I learned a lot at my job” is a topic. This version says exactly what was learned and redefines a familiar word, which gives the essay something to show in scenes.

Thesis statement examples by field

The same qualities apply in every subject, but each field has its own kind of evidence: archives in history, the text in literature, experiments in psychology and biology, data in economics. Each example below points at the evidence it would need.

History

37. In the 1520s, the printing press did less to spread literacy than to spread argument: Martin Luther's pamphlets, often read aloud, turned a dispute among theologians into a public one.
38. American railroads changed the country's sense of time more than its sense of distance: the standard time zones they adopted in 1883 ran the nation's clocks for 35 years before Congress made them law in 1918.
39. The Marshall Plan succeeded less because of the money it sent than because it required European governments to plan their recovery together, which laid groundwork for later economic cooperation.

Literature

40. In Pride and Prejudice, a letter changes Elizabeth's mind where no conversation could: she revises her view of Darcy only when she can reread his account alone.
41. The whaling chapters of Moby-Dick are the novel's argument rather than a digression: by making the reader learn the whale piece by piece, Melville shows why Ahab's single vision of it is madness.
42. Frederick Douglass makes literacy the plot of his 1845 Narrative: each lesson he takes from the boys in Baltimore's streets is a step out of slavery.

Psychology

43. Students remember more after taking practice tests than after rereading their notes, so study guides should end with questions instead of summaries.
44. The bystander effect is better explained by uncertainty than by indifference: when an emergency is unmistakable, the presence of other people delays help far less than the classic laboratory studies suggest.
45. Streaks in habit-tracking apps motivate through fear of loss, which is why breaking a long streak often ends the habit instead of interrupting it.

Biology

46. Monarch butterfly numbers depend more on milkweed along the summer breeding range than on the winter forests in Mexico, so conservation money goes further when it restores breeding habitat.
47. Birds in noisy cities are changing how they sing, not just how loudly: urban great tits sing at higher pitches than forest birds, which suggests that traffic noise is shaping how they communicate.
48. Wolves alone did not restore Yellowstone's streams after their return in 1995; the recovery of willows and aspens also depended on beavers, bison and weather, which makes the park a weaker example of a trophic cascade than it is often said to be.

Economics and business

49. Cities that want drivers to accept congestion pricing should run a trial before any vote, because support tends to rise once people see emptier streets, as it did in Stockholm in 2006.
50. Tipping persists in American restaurants less because it improves service than because it lets menus show lower prices, which makes a restaurant that includes service in its prices look more expensive than it is.
51. Loyalty programs make customers less sensitive to price than discounts do, because a points balance gives shoppers a reason to come back that a one-time coupon cannot.

Education

52. Schools should teach students to read cursive even if they stop teaching them to write it, because reading old letters and documents is the cursive skill most adults still need.
53. High schools that start later in the morning get more learning from teenagers than schools that add class time, because adolescents' sleep cycles shift later during puberty.
54. Group projects teach collaboration only when each member is graded on a visible part of the work; otherwise they reward the student who does everything and the ones who let them.

Environmental science

55. Composting food scraps cuts a city's methane emissions more cheaply than capturing gas at the landfill, because scraps that break down with oxygen give off little methane, while the same scraps buried in a landfill rot without it.
56. Restored wetlands can protect coastal towns from storm surges at a lower long-term cost than seawalls, because wetlands rebuild themselves while seawalls must be maintained and raised.
57. Grass lawns in dry western cities are a water policy question rather than a matter of taste, because outdoor watering makes up a large share of household water use there.

Technology

58. Phone makers should be required to sell spare parts and publish repair manuals for years after a model is released, because a phone that cannot be fixed turns a minor fault into electronic waste.
59. Password rules that force regular changes make accounts less secure, because people respond with predictable patterns; long passphrases that change only after a breach work better.
60. Text-message codes are better than no second sign-in step but weaker than an authenticator app or a hardware key, because phone numbers can be hijacked through SIM swapping.

Several of these take sides on questions where informed people disagree. That is the point of a thesis, not an endorsement: an essay arguing the opposite of number 46 or number 53 could be just as strong with the right evidence.

Thesis patterns you can adapt

Patterns help with a first draft. Fill one in, then rewrite it in your own words so the sentence doesn't sound like a form.

Where it goes and how long

In most class essays the thesis is the last sentence of the introduction. The opening lines draw the reader in (see these essay hook examples), the next few give context, and the thesis tells the reader where the rest of the essay is going. Readers and graders look for it there, so don't bury it in the middle of the paragraph.

• Length. Usually one sentence for an essay under about 2,000 words; two or three sentences, or a short paragraph, for a long research paper. If yours runs longer, you probably have a thesis and an outline fused together.
• Listing the points. A “map” thesis names the main reasons in the order the body takes them, which suits five-paragraph and timed essays. In longer essays an open thesis, one claim without the list, reads better; the introduction's last sentences can preview the route instead.
• Later placement. Some research papers state the thesis after a short review of what others have argued, and some exploratory essays hold it until the end on purpose. Both are fine when the reader can still tell where the essay is heading.
• First person. “I argue that…” is acceptable in many humanities essays, and APA style allows “I” and “we” when you describe your own work. Some instructors still prefer third person, so check. What weakens a thesis is the announcement (“In this essay I will discuss…”), not the pronoun.

The thesis is also where the page layout starts to matter: the essay format guide shows where the introduction sits on an MLA, APA or Chicago first page.

How a thesis changes as you research

The thesis you start with is a working thesis: a guess that tells you what to look for. Expect it to change. Here is one thesis through three drafts, on a city-council question about leaf blowers.

1. Working thesis, before research

   “Cities should ban gas leaf blowers because they are loud.” It takes a side, but the only reason is one everyone already knows, and a reader's first question (what about the people who use them for work?) has no answer.

2. After reading the sources

   “Cities should phase out gas leaf blowers, because their small engines produce far more noise and exhaust than their size suggests, and electric models can now do most of the same work.” The research supplied a second reason and a realistic alternative, and “phase out” is easier to defend than “ban”.

3. After the first draft

   “Cities should phase out gas leaf blowers over three years, with rebates for landscaping crews, because the noise and exhaust fall hardest on the workers who run the machines all day.” Drafting the counterargument changed the stakes: the strongest reason turned out to be the workers, and the rebate answers the cost objection inside the thesis.

Revise the thesis last, after the conclusion. If the conclusion says something the thesis doesn't, it often records what the essay actually found, so check whether the thesis should move to meet it.

Thesis statement checklist

A common problem in a finished draft is drift: the thesis promises one thing and the body paragraphs prove something nearby. If your course allows assistant tools, you can ask the Strokes Assistant to read the essay against its thesis and list the paragraphs that don't support it.