How to Write an Essay Conclusion
Most conclusions repeat the thesis and list what the body paragraphs already said. That is the kind of conclusion graders skim. A conclusion that extends the argument — and takes about the same length as the introduction — is the one that turns a solid essay into a memorable one.
What the conclusion is for, and what it is not for
The conclusion is not a summary. Summaries are useful when the reader skimmed and needs a reminder of what they missed; graders did not skim, they just read the essay, and they do not need the reminder. What they need is a reason the essay mattered — a sentence that shows them the argument they just read earns them something they could not have seen before reading it. Call this move 'extension'. An extension conclusion ties back briefly to the thesis, but then it does one new thing: it lands a broader implication, a counterintuitive consequence, or a connection to an adjacent question that the introduction did not already mention. The essay becomes larger than its thesis in the last paragraph, and that enlargement is what makes the grader remember it. In length, the conclusion is roughly the same as the introduction — about 100 to 150 words for a 1,000 word essay. Much shorter and it feels unfinished; much longer and it starts repeating itself. Target the same ballpark as the intro and stop when the extension move lands.
What to cut first
Three phrases should never appear in a conclusion. 'In conclusion' — graders can see that this is the last paragraph without being told. 'To sum up' — same reason. 'As I have shown in this essay' — self-referential, tells the reader you are about to repeat yourself. Each of these phrases is an apology for taking the reader's time, and apologies do not belong in the strongest paragraph of the essay. Also cut the full restatement of the thesis. A brief tie-back is useful — one phrase, not a full sentence — but a paragraph that opens 'As demonstrated throughout this essay, the argument that X is most defensible' is a paragraph that has nothing new to say and is filling space. If you find yourself writing that sentence, delete it and start the conclusion with the extension move directly. The reader will follow.
The three extension moves
The three extension moves that work most often are the broader implication, the counterintuitive consequence, and the next question. The broader implication takes the specific claim the essay made and shows why it matters beyond the essay's immediate frame — a literary analysis that ends by suggesting what the close reading reveals about the author's later work; a political science essay that ends by showing what the theoretical lens buys us for other cases. The counterintuitive consequence takes the thesis seriously enough to show an implication that runs against common sense, or against what the reader might have expected. The next question frames a follow-up the essay cannot answer in the space it has but that naturally emerges from what it did answer, and it hands that question to the reader as a gift. Any of the three will work. None of the three are 'in conclusion, this essay has shown'. Pick the one that your specific argument earns, and write it in one or two concrete sentences.
A sample extension close
Take an essay that argued NATO enlargement is a contributing but not determining cause of the US-Russia collapse, with realism capturing the mechanism and constructivism explaining the timing. A weak conclusion: 'In conclusion, this essay has shown that NATO enlargement contributed to the deterioration of US-Russia relations, but was not the only cause. Both realism and constructivism help explain what happened.' Two sentences of restatement, nothing new. A working extension close: 'If the realist and constructivist accounts are each partially right, IR theory is being asked to do something it usually resists: treat material and ideational causes as complementary rather than rival. That synthesis is uncomfortable, because it gives up the clean predictions either tradition prefers. It is also probably where the most useful work on the next decade of great-power politics will have to sit.' Three sentences that take the thesis seriously, land an implication the introduction did not promise, and point the reader toward what the essay could not cover. The grader remembers it.
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