The MCAT Explained: Sections, Scoring, and Test Structure

What the MCAT is and who takes it

The Medical College Admission Test (MCAT) is a standardized, computer-based exam developed and administered by the Association of American Medical Colleges (AAMC). Almost every medical school in the United States and Canada requires an MCAT score as part of the application.

The MCAT does not test whether you have memorized a medical textbook. It measures the science knowledge, reasoning, and critical-thinking skills that medical educators consider a foundation for success in medical school. It draws on introductory-level biology, general and organic chemistry, physics, biochemistry, psychology, and sociology, plus a reading-and-reasoning section.

This guide explains how the exam is built and scored. It is separate from the application process itself — for how AAMC and AMCAS handle your application, see the linked application guide.

The four sections

The MCAT has four multiple-choice sections. Three are science-and-reasoning sections built around short passages plus stand-alone questions; the fourth is a pure reading-and-reasoning section that uses no outside science knowledge.

Each science section blends content areas rather than testing one subject in isolation — for example, a biochemistry passage may pull in cell biology and organic chemistry in the same set of questions.

• Biological and Biochemical Foundations of Living Systems — biology and biochemistry, with general and organic chemistry
• Chemical and Physical Foundations of Biological Systems — general chemistry, physics, organic chemistry, and biochemistry
• Psychological, Social, and Biological Foundations of Behavior — psychology, sociology, and biology
• Critical Analysis and Reasoning Skills (CARS) — reading passages from humanities and social sciences; no prior subject knowledge needed

Question counts and timing

Each of the three science sections contains 59 questions with 95 minutes allotted; the CARS section contains 53 questions with 90 minutes. That is 230 questions and 6 hours 15 minutes of content time in total.

With the mid-exam break and two optional shorter breaks added, the total seated time is about 7 hours and 30 minutes — one of the longest standardized admissions exams. Test day is a stamina exercise as much as a knowledge one.

Exact question counts, timing, and break rules are published in the AAMC's official MCAT Essentials for the testing year. Confirm the current figures on the official AAMC website before you build a test-day plan.

• Chemical and Physical Foundations — 59 questions, 95 minutes
• Critical Analysis and Reasoning Skills — 53 questions, 90 minutes
• Biological and Biochemical Foundations — 59 questions, 95 minutes
• Psychological, Social, and Biological Foundations — 59 questions, 95 minutes

How the MCAT is scored

Each of the four sections is scored on a scale from 118 (lowest) to 132 (highest), with a midpoint of 125. The four section scores are added together to produce a total score that ranges from 472 to 528, with a midpoint of 500.

Your section scores are based on the number of questions you answer correctly — nothing is subtracted for a wrong answer. Because of this, a wrong answer and a blank answer count the same, so there is no penalty for guessing. Answer every question.

Raw correct-answer counts are converted to scaled scores through a process called equating, so that a given scaled score means the same level of ability no matter which version of the exam you took. AAMC does not release the raw-to-scaled conversion.

Percentile ranks and score reports

Along with your five numbers — four section scores and one total — your score report shows a percentile rank for each, telling you the share of test takers who scored at or below you. AAMC updates the percentile tables periodically, so the same scaled score can map to a slightly different percentile over time.

Your report also includes confidence bands, which show the range your true ability likely falls within, and score-profile information some schools use in review. Medical schools receive scores directly from AAMC.

There is no single "passing" MCAT score. Each medical school sets its own expectations, and admissions is holistic — grades, experiences, essays, and interviews all matter alongside the number.

Retaking and score validity

AAMC limits how often you can sit the MCAT within a single testing year, across two consecutive years, and over a lifetime, and it counts voided and no-show attempts toward those limits. Review the current retake rules on the official AAMC site before registering for a repeat attempt.

Most medical schools accept MCAT scores from a defined number of recent years, but each school sets its own validity window. Check the requirements of every program on your list rather than assuming a single rule.

Because registration windows, fees, and score-release dates change each testing year, always plan around the current AAMC calendar rather than an older one.