How many sources do you have to use in the synthesis essay?

You must incorporate at least three of the provided sources to support your argument. Using more is fine, but what earns points is how well your commentary connects each source to your position — not the raw count.

How long should the AP Lang synthesis essay be?

There is no required length. You have about 40 minutes to write after the 15-minute reading period. Most high-scoring responses are four to six paragraphs — long enough to develop an argument with evidence and commentary, not padded for length.

Can I disagree with all the sources?

Your position has to be defensible and you must still use at least three sources, but you can push back on them. Using a source to set up a view you then complicate or refute is often stronger than agreeing with everything.

The AP Lang Synthesis Essay

The synthesis essay is the first free-response question on the AP English Language exam. You are given a prompt and six or seven short sources, and 15 minutes of suggested reading time plus 40 minutes to write. The task is not to summarize the sources — it is to build your own argument and use the sources as evidence to support it. Like every AP Lang essay, it is scored out of 6 on the analytic rubric.

What readers are actually looking for

A synthesis essay lives or dies on whether you have a position of your own. The sources are raw material; your job is to take a defensible stance on the prompt and bring in at least three sources to develop it. The most common way students lose points is writing a “source report” — one paragraph per source, summarizing each — instead of organizing the essay around their own argument.

A structure that works

Intro + thesis: take a clear, defensible position on the prompt (Row A).
Body paragraphs by idea, not by source: each paragraph makes a point in your argument and pulls in whichever source(s) support it, with commentary explaining the connection (Row B).
Engage a counterargument: acknowledging and answering the other side is one reliable path to the sophistication point (Row C).

Citing sources correctly

You must cite at least three of the provided sources. Reference them by their label (for example, “Source C”) or by the author/title given. You do not quote at length — a short quotation or a paraphrase with a citation is enough, as long as your commentary does the real work of connecting it to your argument.

Sources are arguments too. When a source leans on the author's credentials (ethos), loaded diction, or an emotional appeal (pathos), pointing that out lets you judge how much weight it should carry, which is a sign of the complex understanding readers reward. The list of AP Lang rhetorical devices helps you spot those moves quickly.

Practice and get it scored

Write a timed synthesis response, then paste it into our AP Lang essay grader and select the synthesis prompt type to get a 6-point score with feedback on each row. Then see where it would land overall with the score calculator, or study the other two tasks — the rhetorical analysis essay and the argument essay.

Worked examples, scored row by row

Seeing the rubric applied is faster than reading about it. These are original synthesis essays written to illustrate each score band, each annotated with why it earned (or lost) every point:

Synthesis essay scored 6/6 — a 1-4-1 that turns the counterargument into support.
Synthesis essay scored 4/6 — a 1-3-0 that cites three sources but only restates them; see exactly what to fix.

Frequently asked questions

How many sources do you have to use in the synthesis essay?: You must incorporate at least three of the provided sources to support your argument. Using more is fine, but what earns points is how well your commentary connects each source to your position — not the raw count.
How long should the AP Lang synthesis essay be?: There is no required length. You have about 40 minutes to write after the 15-minute reading period. Most high-scoring responses are four to six paragraphs — long enough to develop an argument with evidence and commentary, not padded for length.
Can I disagree with all the sources?: Your position has to be defensible and you must still use at least three sources, but you can push back on them. Using a source to set up a view you then complicate or refute is often stronger than agreeing with everything.

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