Writing

How to write a thesis statement

Q: Where does the thesis statement go?

Usually at the end of your introduction, so readers know your argument before the body begins.

Your thesis is the one sentence your whole paper defends. Here’s a formula, and the difference between a weak and a strong one.

A simple formula

[specific topic] + [your claim] + [main reasons / how]

A good thesis is specific, arguable (someone could reasonably disagree) and focused enough to cover in your paper.

Weak vs strong

Weak

“Social media affects teenagers.” — too vague, and no one would disagree.

Strong

“Evening social-media use harms teenage sleep by delaying melatonin release, so schools should teach screen-curfew habits.” — specific, arguable, and previews the reasons.

Three common types

Argumentative: takes a side and defends it (most essays).
Analytical: breaks a topic down and explains how the parts relate.
Expository: explains a topic clearly without arguing a position.

Place the finished statement at the end of your introduction, then make sure every body paragraph supports it — see how to structure a paper.

Frequently asked questions

Where does the thesis statement go?

Usually at the end of your introduction, so readers know your argument before the body begins.

How long should it be?

Normally one or two sentences. It should be specific enough to preview your whole argument, not a vague topic.

What’s the difference between a topic and a thesis?

A topic is what you’re writing about (“social media and sleep”). A thesis takes a position on it (“Evening social-media use harms teenage sleep by delaying melatonin release”).

Can my thesis change as I write?

Yes — it’s normal to refine it once your research and argument take shape. Update the statement to match your final paper.

These guides explain the current editions in plain language and are a study aid, not official style manuals. For exact rules and edge cases, check your assignment brief and the official APA, MLA or Chicago guidance — and when in doubt, ask your instructor.