AP Calculus AB and BC
AP Calculus Exam Format: Sections, Timing, and Scoring
The AP Calculus AB and BC exam runs 3 hours 15 minutes, built the same way for both courses. Section I is 45 multiple-choice questions in 105 minutes; Section II is 6 free-response questions in 90 minutes. Each section has a no-calculator part and a calculator part, and each section is worth half the score.
Two sections, four parts, 3 hours 15 minutes
Every AP Calculus exam, AB and BC alike, has the same shape: two sections split across four parts, timed for 3 hours 15 minutes in total. Section I is multiple choice; Section II is free response. The two courses are built the same way and differ only in the content tested, not in the format, timing, or calculator rules.
| Section / part | Questions | Calculator | Time | Weight (derived) |
|---|---|---|---|---|
| Section I, Part A (multiple choice) | 30 | Not permitted | 60 min | 33.3% |
| Section I, Part B (multiple choice) | 15 | Required | 45 min | 16.7% |
| Section II, Part A (free response) | 2 | Required | 30 min | 16.7% |
| Section II, Part B (free response) | 4 | Not permitted | 60 min | 33.3% |
Add the parts and the structure is symmetric. Section I holds 45 multiple-choice questions across 105 minutes; Section II holds 6 free-response questions across 90 minutes. The College Board publishes weights only at the section level: multiple choice is 50% of the score, and free response is the other 50%. The per-part percentages in the table above are not published separately; they are derived from those section weights by assuming every question within a section counts equally, so each of the 45 multiple-choice questions and each of the 6 free-response questions carries an equal share.
The two halves are equal
Section I and Section II each count for half the composite score, so a student who is strong on multiple choice but freezes on free response, or the reverse, leaves half the exam on the table. Prepare for both formats on purpose.
What a calculator is allowed to do, and where
A graphing calculator is required on exactly two of the four parts and not permitted on the other two. Section I Part B and Section II Part A allow the calculator; Section I Part A and Section II Part B do not. The no-calculator parts are the larger multiple-choice part and the final free-response part.
- No calculator: Section I Part A (30 multiple-choice questions) and Section II Part B (4 free-response questions).
- Graphing calculator required: Section I Part B (15 multiple-choice questions) and Section II Part A (2 free-response questions).
- The two no-calculator parts together are 66.7% of the score, so most of the exam is worked by hand.
Practice the split, not just the topics
Because two thirds of the score comes from no-calculator parts, most practice should be pencil and paper so the machine never becomes a crutch. On the calculator parts, the exam expects you to write the exact integral or equation first and then evaluate it numerically; the setup earns the point even if the arithmetic slips.
Pacing: how many minutes each question gets
Divide each part's time by its question count and the exam's rhythm becomes concrete. Multiple-choice questions come fast; free-response questions are long and multi-part, so the two sections need different pacing instincts.
So Part A gives you about 2 minutes per multiple-choice question and Part B about 3 minutes, since calculator questions usually take longer to set up. Free response runs at a completely different pace.
| Part | Questions | Time | Minutes per question |
|---|---|---|---|
| Section I, Part A | 30 | 60 min | 2.0 |
| Section I, Part B | 15 | 45 min | 3.0 |
| Section II, Part A | 2 | 30 min | 15.0 |
| Section II, Part B | 4 | 60 min | 15.0 |
Bank time on the easy ones
Two to three minutes per multiple-choice question is not much, so move fast on the ones you recognize and flag the rest to revisit. A blank cannot earn a point, so put an answer on every multiple-choice question before time is called.
How the 1 to 5 score is built
Your raw work becomes a composite score: multiple-choice points and free-response points are combined, with each section contributing half. The College Board then maps that composite onto the reported 1 to 5 scale.
That mapping is criterion referenced, not a curve. The score boundaries are set to reflect a fixed standard of what a 5, 4, 3, 2, or 1 represents, rather than to rank you against the other students who happened to sit the exam that year. The exact composite cut points shift slightly from year to year and are not published in advance, so there is no fixed number of points to memorize as the line for a 5.
A 3 is the score most colleges treat as the threshold for credit, but each college sets its own policy, so check the schools you care about. Because the two sections weigh equally, points left on the free-response section cost exactly as much as missed multiple-choice questions.
What the odds look like on AB
On the May 2025 AP Calculus AB exam, 64.2% of the 286,722 students scored a 3 or higher and 20.3% earned a 5, with a mean score of 3.21. The exam is demanding but very passable with steady, weight-aware preparation.
AB versus BC: same format, different content
AB and BC sit for the same-shaped exam: the same two sections, the same four parts, the same 3 hours 15 minutes, the same calculator rules, and the same 1 to 5 scale. What changes is the content. BC covers everything on AB and adds more, so the per-unit weighting shifts and BC pulls in whole topics AB never sees.
BC adds two entire units plus several topics inside the units the two courses share:
- Unit 9, Parametric Equations, Polar Coordinates, and Vector-Valued Functions, worth 10-15% of the BC exam, is BC only.
- Unit 10, Infinite Sequences and Series, worth 15-20% of the BC exam, is BC only.
- Inside shared units, BC adds integration by parts (Topic 6.11), linear partial fractions (Topic 6.12), improper integrals (Topic 6.13), Euler's method (Topic 7.5), logistic models (Topic 7.9), and arc length (Topic 8.13).
Because Units 9 and 10 claim a large share of the BC exam, the units AB and BC share are weighted more lightly on BC. Unit 1 is 10-15% of the AB multiple-choice section but 5-10% on BC, and Unit 5 falls from 15-20% on AB to 10-15% on BC. Unit 6 stays heavy on both at 15-20%.
The BC exam's AB subscore
Every BC exam also produces a separate AB subscore, a 1 to 5 score based only on the questions covering AB-level content. It reports how a BC student did on the AB core, and it can earn AB-equivalent credit on its own even when the overall BC score is lower. AB-only students do not receive a subscore.
Worked examples
Worked example
Pacing Section I so no question goes unanswered
Section I gives you 105 minutes for 45 multiple-choice questions: 30 questions in Part A with no calculator (60 minutes), then 15 questions in Part B with a calculator (45 minutes). How much time does each question get, and what pacing plan keeps you from running out before the last question?
- Find the pace for Part A. Divide the time by the questions: 60 minutes over 30 questions is 2 minutes per question. Treat that as a ceiling, not a target; banking time on the easy questions leaves more for the hard ones.
- Find the pace for Part B. 45 minutes over 15 questions is 3 minutes per question. Calculator questions run a little longer to set up, so the extra minute per question is expected, not slack to spend early.
- Set checkpoints instead of watching every question. In Part A, aim to reach question 15 by the 30-minute mark and question 30 by 60 minutes. In Part B, aim to be at question 8 around the 24-minute mark. A checkpoint every stretch catches a slow start while you can still fix it.
- Guard the last questions. When two or three minutes remain in a part, stop starting new questions and make sure every answer in that part is filled in. A blank cannot score, and a quick guess on a question you did not reach still has a chance.
- Notice how different Section II feels. Six free-response questions in 90 minutes is 15 minutes each, a completely different rhythm: fewer, deeper questions where showing the setup and the justification is where the points are. Do not carry the multiple-choice sprint into free response.
Budget about 2 minutes per no-calculator question in Part A and 3 minutes per calculator question in Part B, check your pace at questions 15 and 30 in Part A and around question 8 in Part B, and fill in every answer before time is called. Section II is a slower 15 minutes per free-response question, so switch rhythms when you reach it.
Frequently asked questions
How long is the AP Calculus exam?
3 hours 15 minutes, the same for AB and BC. Section I (multiple choice) is 105 minutes for 45 questions, split into a 60-minute no-calculator Part A of 30 questions and a 45-minute calculator Part B of 15 questions. Section II (free response) is 90 minutes for 6 questions, split into a 30-minute calculator Part A of 2 questions and a 60-minute no-calculator Part B of 4 questions.
Can you use a calculator on every part of the AP Calculus exam?
No. A graphing calculator is required on Section I Part B and Section II Part A, and not permitted on Section I Part A and Section II Part B. The two no-calculator parts together make up 66.7% of the score, so most of the exam is worked by hand.
Is AP Calculus BC scored differently from AB?
No, both use the same two-section format, the same 3 hours 15 minutes, and the same 1 to 5 scale. The difference is content: BC covers all of AB plus Units 9 and 10 and several extra topics, weighted differently. Every BC exam also reports a separate AB subscore, a 1 to 5 score based on the AB-level questions, which AB-only students do not receive.
How is the 1 to 5 score calculated?
Multiple-choice and free-response points combine into a single composite, with each section worth half. The College Board maps that composite onto the 1 to 5 scale using score boundaries set to a fixed standard rather than a curve, so the cut points shift slightly each year and are not published ahead of time.