Desmos on Bluebook: what students can and cannot use

The question teachers ask most about the digital AP Calculus exam is not whether students get a calculator — it is what kind, and where. The answer is now published plainly on College Board's AP Exams Calculator Policy page.

What is allowed

On the exams where calculators are permitted, College Board's policy says students can use an approved handheld calculator and/or the Desmos built-in calculator through the Bluebook testing application. In other words: the on-screen tool is a full, sanctioned option, not a fallback — a student who arrives with no handheld is not disadvantaged, provided they know the tool.

Where the built-in calculator turns on

This is the sentence that matters for Calculus. College Board's policy states that for Calculus AB, Calculus BC and Precalculus, the Desmos calculator is available only in the calculator-required parts of the exam — and those exams continue to have parts where no calculator is allowed.

On the published exam format, that gives students the built-in calculator in exactly two places:

• Section I, Part B — 13 multiple-choice questions, 38 minutes (calculator required).
• Section II, Part A — 2 free-response questions, 30 minutes (calculator required).

And nowhere else. The no-calculator parts are:

• Section I, Part A — 29 multiple-choice questions, 62 minutes.
• Section II, Part B — 4 free-response questions, 60 minutes.

What this means in the classroom

The exam deliberately keeps a large no-calculator stretch — 29 multiple-choice questions and 4 free-response questions — so algebraic fluency and estimation still carry real weight. A student who has quietly outsourced every computation to Desmos is exposed exactly there. Two habits pay off:

• Practise the section boundaries, not just the content. Time a set of 29 questions in 62 minutes with the calculator closed. The skill being tested is judgement about when a tool helps — and it is tested by removing the tool.
• Let students meet the built-in tool before exam day. The Bluebook app offers test previews; a few minutes poking at the on-screen calculator removes a first-contact surprise on the morning of the exam.

The rules that go with it

College Board's policy also spells out the conduct rules around calculators: proctors are required to check handheld calculators before the exam; calculators may not be shared, and communication between calculators is prohibited during the exam; and students must not use calculator memory to take test materials out of the room. Worth stating out loud to a class — these are the things that get scores cancelled, and they are avoidable.

What we have not stated

The policy page confirms that the built-in tool is Desmos and where it is available. It does not enumerate feature-by-feature what the on-screen calculator can do, so we are not going to claim that here — check the Bluebook test preview for the current build before you build a lesson around a specific function.

• Sources (all checked 8 October 2026): AP Central — AP Exams Calculator Policy; exam format from the AP Calculus AB exam page (identical on the AP Calculus BC exam page).