Is the OAT harder than the DAT? An honest comparison

Neither the OAT nor the DAT is universally harder. They come from the same testing service and share most of their science content, so the real difference is one section: the OAT has a Physics section and no Perceptual Ability Test, while the DAT has the Perceptual Ability Test and no Physics. Which exam feels harder depends entirely on you. If you are strong in physics, the OAT will probably feel easier; if you are strong in spatial reasoning, the DAT will. The two are scored on different scales, so you cannot compare the numbers directly.

Pre-health students cross-shopping optometry and dentistry ask this constantly, usually hoping one exam is the "easy" path. It is not that simple. The OAT (Optometry Admission Test) and the DAT (Dental Admission Test) are close cousins, both run by the American Dental Association's testing service and taken at Prometric centers. Most of what you study transfers between them. The honest comparison comes down to a single swapped section and how your own strengths line up with it.

Is the OAT harder than the DAT?

There is no consensus that either exam is harder overall, because they test almost the same material with one key substitution. The OAT includes Physics where the DAT includes the Perceptual Ability Test. Everything else, Biology, General Chemistry, Organic Chemistry, Reading Comprehension and a quantitative section, appears on both. So "harder" is personal. A student who did well in a physics sequence usually finds the OAT more approachable, while a student with strong visual and spatial skills often prefers the DAT. Difficulty tracks the swapped section far more than any general gap in rigor between the two exams.

What is the difference between the OAT and the DAT?

The core difference is Physics versus the Perceptual Ability Test, but a few other details differ too. The table below lays out the current formats side by side.

Notice the scales are different: the OAT runs 200 to 400 with a national mean of about 300, while the DAT moved to a 200 to 600 scale in March 2025. That is why you cannot say "a 320 OAT equals a 21 DAT" or line the numbers up at all. Each exam is normed on its own scale against its own applicant pool.

Does the OAT have a Perceptual Ability Test?

No. The OAT does not have a Perceptual Ability Test. That section, which tests two- and three-dimensional spatial reasoning through subtests like keyhole views, angle ranking and pattern folding, is unique to the DAT, where dental schools value it as a proxy for the hand-eye and spatial skills dentistry demands. Optometry admissions do not use it. Instead the OAT devotes a section to Physics, covering mechanics, waves, optics, electricity and the rest of an introductory physics sequence. If spatial puzzles are your weakness, that alone can make the OAT the more comfortable exam.

Which is easier to study for, the OAT or the DAT?

Most of your prep overlaps, so the answer again comes down to the swapped section. The Perceptual Ability Test on the DAT cannot be crammed from a textbook; it rewards weeks of repeated practice until the mental rotations become automatic, which some students find frustrating and others find fun. Physics on the OAT is more like a normal science section: if you took physics and remember the formulas, focused review gets you there, but if you never took it or struggled, it becomes the section that needs the most work. Be honest about which of those two describes you, and that tells you which exam is the lighter lift.

How is the OAT scored compared to the DAT?

The OAT reports standard scores from 200 to 400 per section, where 300 is the national average, near the 50th percentile, and 320 or higher is generally competitive. Your Academic Average is the mean of your six section scores, and Total Science combines Biology, both Chemistries and Physics. The DAT now uses a 200 to 600 scale in 10-point steps, where the national average Academic Average is about 400. Both exams have no fixed passing score; each professional school decides what it considers competitive. Because the scales differ, always judge a score against the norms and admitted-student averages of the exam you are actually taking.

Should I take the OAT or the DAT?

Take the one that matches your career, not the one you think is easier. If you want to be an optometrist, take the OAT; if you want to be a dentist, take the DAT. In the rare case where you are genuinely undecided between the two professions, your relative strength in physics versus spatial reasoning can be a tiebreaker on exam comfort, but it should never outweigh which career you actually want. Once you have chosen, map out a study plan that front-loads your weakest section, whether that is Physics or the Perceptual Ability Test, since that is where focused practice moves your score the most.

Whichever exam you take, the method is the same: high-volume, section-weighted practice with explanations, not passive rereading. An AI tutor generates unlimited exam-style questions on the exact sections you keep missing, explains the reasoning behind each answer, and answers your follow-up questions at any hour. Start with unlimited OAT practice questions across all four sections, or if dentistry is your path, our DAT practice test covers that exam and its new score scale.

The short version

Neither the OAT nor the DAT is harder in general; they share most content and differ in one section. The OAT has Physics and no Perceptual Ability Test, the DAT has the Perceptual Ability Test and no Physics, and they use different score scales (200 to 400 versus 200 to 600), so the numbers do not compare. Pick the exam that matches your career, then front-load whichever swapped section is your weakness. Study both the same way: heavy question practice with explanations, weighted to the sections you miss most.