What Is the Difference Between AP Calculus AB and BC?
The difference in AP Calculus AB vs BC is how much calculus each course covers. College Board describes AP Calculus AB as equivalent to a first-semester college calculus course devoted to differential and integral calculus. It describes AP Calculus BC as equivalent to that first-semester course and the single-variable calculus course that follows it, and says BC covers many of the principles in AB and builds on them.
The recommended preparation is nearly the same. For both courses College Board lists courses in algebra, geometry, trigonometry, analytic geometry, and elementary functions. For BC it adds an understanding of sequences, series, and polar equations. AB is not listed as a prerequisite for BC.
Which Topics Does AP Calculus BC Add to AB?
AB has 8 units and BC has 10. The first eight units have the same names in both courses, and BC adds two more. The table shows the share of the exam score College Board assigns to each unit.
| Unit | AP Calculus AB | AP Calculus BC |
|---|---|---|
| 1. Limits and Continuity | 10% to 15% | 5% to 10% |
| 2. Differentiation: Definition and Fundamental Properties | 10% to 15% | 5% to 10% |
| 3. Differentiation: Composite, Implicit, and Inverse Functions | 5% to 10% | 5% to 10% |
| 4. Contextual Applications of Differentiation | 10% to 15% | 5% to 10% |
| 5. Analytical Applications of Differentiation | 15% to 20% | 10% to 15% |
| 6. Integration and Accumulation of Change | 15% to 20% | 15% to 20% |
| 7. Differential Equations | 5% to 10% | 5% to 10% |
| 8. Applications of Integration | 10% to 15% | 5% to 10% |
| 9. Parametric Equations, Polar Coordinates, and Vector-Valued Functions | Not in AB | 10% to 15% |
| 10. Infinite Sequences and Series | Not in AB | 15% to 20% |
BC also goes further inside three of the shared units. Its course page lists improper integrals in Unit 6, the Euler method and logistic models in Unit 7, and the length of a curve in Unit 8, none of which appear on the AB page.
How Do the AP Calculus AB and BC Exams Compare?
The two exams have the same format and are given at the same time. Both are on Monday, May 10, 2027, in Session 1, and College Board states that a student may not take both exams in the same year. Each exam is hybrid digital: students answer multiple-choice questions in the Bluebook app and write free-response answers by hand in paper booklets.
| Section | Questions | Time | Share of score |
|---|---|---|---|
| Section I: Multiple choice | 42 (29 without a graphing calculator, 13 with one required for some questions) | 1 hour 40 minutes | 50% |
| Section II: Free response | 6 (2 with a graphing calculator required, 4 without) | 1 hour 30 minutes | 50% |
A BC exam produces a score and a subscore. College Board reports a Calculus AB subscore from 1 to 5 alongside the BC score, based on the part of the exam devoted to AB topics, which is approximately 60% of the exam. College Board recommends that colleges treat the subscore as they would an AP Calculus AB score, and notes that each college sets its own policy. The length of every AP exam is listed in our guide to how long AP exams are.
Is AP Calculus BC Harder Than AB?
BC covers more material, and its exam results are nevertheless higher. On the 2026 exams, 82% of BC students scored 3 or higher and 46% earned a 5, against 65% and 20% for AB.
| Year | AB: scored 5 | AB: 3 or higher | AB: test takers | BC: scored 5 | BC: 3 or higher | BC: test takers |
|---|---|---|---|---|---|---|
| 2026 | 20% | 65% | Not yet published | 46% | 82% | Not yet published |
| 2025 | 20.3% | 64.2% | 285,891 | 44.0% | 78.6% | 160,436 |
| 2024 | 21.4% | 64.4% | 278,657 | 47.7% | 80.9% | 148,191 |
| 2023 | 22.4% | 58.0% | 273,987 | 43.5% | 78.5% | 135,458 |
The two exams are taken by different groups of students, and BC had fewer test takers: 160,436 in 2025 against 285,891 for AB. In our view, the results show that the students who choose BC are well prepared for it, not that BC is the lighter course, and a student who found precalculus hard is likely to find the pace of BC harder than the pace of AB. Our guide to AP Precalculus covers the course that comes before either one.
What Do MIT and Caltech Say About High School Calculus?
MIT says students are much more likely to succeed there when they have taken math throughout high school, including at least some exposure to the foundations of calculus, by which it means any class that teaches core concepts such as differentiation and integration. All MIT students, regardless of major, must take or receive credit for both single-variable and multivariable calculus. Its credit policy for the class entering in fall 2026 grants credit for 18.01, its single-variable calculus subject, for a score of 5 on the AP Calculus BC exam. A score of 5 on the AB exam allows a student to enroll in an accelerated calculus sequence. MIT notes that the policy is subject to change for later classes.
Caltech requires four years of math, including one year of calculus. Where calculus is not available or cannot be scheduled, and the student and counselor document the reason, its policy for fall 2026 applicants accepts a score of 5 on the AP Calculus AB or BC exam taken by the application deadline. Families applying for a later year should check the page for the current wording. The best colleges for math guide covers the college side for a student drawn to the subject.
Should a Student Take AP Calculus AB or BC?
The decision starts with what the school offers. Where a school teaches AB and BC in successive years, the question is whether to reach AB by junior year so that BC fits in senior year. Where it offers BC directly after precalculus, the question is which course to take once.
At Oriel Admissions we advise BC for a student who did well in precalculus and expects to study engineering, physics, computer science, economics, or mathematics. AB is a sound choice for a student who wants calculus on the transcript without the extra pace, and a student who takes AB as a junior can still take BC, AP Statistics, or a college math course as a senior where the school offers them. In our experience, an A in AB serves a student better than a low grade in BC.
Where calculus falls beside the other junior-year courses is covered in our guide to the best AP courses for junior year, and how a schedule is read against what the school offers in course rigor in college admissions. Credit and placement for either score are decided by each college, and the AP Credit Policy Search from College Board lists the policies.
Frequently Asked Questions About AP Calculus AB vs BC
AB is equivalent to a first semester college calculus course. BC is equivalent to that course plus the single variable calculus course that follows it. BC has 10 units and AB has 8.
BC covers more material. Its results are higher: on the 2026 exams, 82% of BC students scored 3 or higher and 65% of AB students did.
College Board does not list AB as a prerequisite for BC. It lists the same earlier courses for both and adds sequences, series, and polar equations for BC. The school decides the sequence.
No. College Board states that a student may not take both the AB and BC exams in the same year.
It is a score from 1 to 5 reported with the BC score. It is based on the AB topics, which are approximately 60% of the BC exam.
Both exams are on Monday, May 10, 2027, in Session 1. Each lasts 3 hours 10 minutes.
For the class entering in fall 2026, MIT grants credit for 18.01, its single variable calculus subject, for a 5 on the BC exam. A 5 on the AB exam allows a student to enroll in an accelerated calculus sequence.
At Oriel Admissions we advise BC for a student who did well in precalculus and expects to study a math heavy field. AB is a sound choice for a student who wants calculus without the extra pace.
Sources: College Board: AP Calculus AB course page, College Board: AP Calculus AB Exam, College Board: AP Calculus BC course page, College Board: AP Calculus BC Exam, College Board: AP Calculus AB Score Distributions, 2023 to 2026, College Board: AP Calculus BC Score Distributions, 2023 to 2026, College Board: Special Score Structure, Calculus BC, MIT Admissions: Academic foundations, MIT Office of the First Year: Advanced Placement credit, Class of 2030, Caltech: Academic Requirements for First-Year Applicants
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