OAT Scoring Explained: The 200–400 Scale, Percentiles, and How It Differs From the DAT

If you're preparing for the Optometry Admission Test, one of the first things to understand is how your performance gets translated into the numbers optometry schools actually see. The OAT uses a 200–400 scaled score — and if you've spent any time around pre-dental friends, you need to know this is not the same scale as the DAT. Confusing the two is one of the most common mistakes pre-optometry students make, so let's clear it up completely.

The OAT Scale: 200 to 400

Every scored section of the OAT is reported on a scale from 200 to 400, in 10-point increments. That means your possible scores on any section are 200, 210, 220 … up to 400. There are no 305s or 327s — scores always land on a multiple of 10.

The average score across all test takers is 300, which corresponds to roughly the 50th percentile. In other words, a 300 means you scored better than about half of everyone who took the exam.

Here's the key relationship between scaled scores and percentile ranks:

Percentile figures are approximate — the ADA recalculates percentile ranks periodically based on recent test-taker pools, so treat these as a guide rather than exact cutoffs.

Notice how the scale compresses at the top: the jump from 300 to 350 moves you 25 percentile points, but going from 350 to 390 gains you another 23. Every 10 points matters enormously once you're above average, which is why strong prep in your weakest section pays off disproportionately.

The Eight Scores on Your Report

Your OAT score report doesn't give you a single number. It reports eight separate scaled scores:

The two composite scores — Academic Average (AA) and Total Science (TS) — are the numbers optometry schools weigh most heavily. Your AA is the headline number of your application: it's the single score most schools quote when they publish their admitted-student averages. Total Science tells schools how strong you are specifically in the sciences, which matters a great deal for a science-heavy professional program.

Academic Average vs Total Science: Which Matters More?

Both matter, but they answer different questions:

• Academic Average reflects your overall test-taking ability across every section, including Reading Comprehension and Quantitative Reasoning. Schools use it as a general readiness signal.
• Total Science isolates your science mastery. A student with a 340 AA but a 310 TS raises a different flag than a student with a 320 AA and a 350 TS — the second profile looks stronger to an admissions committee evaluating your ability to handle optometry school's science curriculum.

In practice, most schools publish average AA scores for their incoming classes, and competitive applicants aim to be at or above those numbers in both composites. A lopsided profile — say, a 350 AA dragged up by Reading Comprehension while sciences sit at 300 — is weaker than a balanced 330 across the board.

How Raw Scores Become Scaled Scores

You won't see your raw score (the number of questions you answered correctly) on your official report — the ADA converts it to the 200–400 scale. The conversion accounts for slight differences in difficulty between test forms, so a 320 means the same thing no matter which version of the exam you sat.

A few things worth knowing about the conversion:

• There is no penalty for wrong answers. Every question is multiple choice, and unanswered or incorrect questions simply don't add points. Never leave a question blank — a guess has positive expected value.
• Each section is scaled independently. A raw score that earns a 340 in Physics might earn a 320 in Biology, depending on how the test-taking population performed on each section.
• Scores are reported in 10-point increments only. Small raw-score differences near the middle of the pack may not move your scaled score at all, while near the top, one or two extra correct answers can shift you a full 10 points.

OAT vs DAT Scoring: Don't Mix Them Up

This is the critical distinction. The DAT and OAT are sibling exams — both administered by the ADA, both covering biology, general chemistry, organic chemistry, reading comprehension, and quantitative reasoning — but their scoring scales are completely different:

The DAT moved to its 200–600 scale in March 2025. The OAT did not follow — it remains on the 200–400 scale. So when a pre-dental friend brags about a 480, that's roughly equivalent to your 340, not something to panic about. And when you're reading advice online, always check which exam the author is talking about: a "400 is average" statement is about the DAT, while "300 is average" is about the OAT.

Why does this matter beyond bragging rights? Because study resources, percentile tables, and "what's a good score" guides are not interchangeable between the exams. Using a DAT percentile table to interpret your OAT score will mislead you badly. Bookmark OAT-specific resources — like OAT — and double-check the scale on anything you read.

When and How You Get Your Scores

Your scoring timeline looks like this:

1. Test day: you receive an unofficial score report at the Prometric center before you leave. These are your scaled scores, and they're almost always identical to the official ones.
2. 2–4 weeks later: official scores are transmitted to the optometry schools you selected during registration.
3. Your record: scores are tied to your DENTPIN and remain part of your testing history, including any retakes.

Because schools see your full testing history, retaking to chase a marginal gain can backfire if the second score is lower. Most advisors suggest retaking only if you're confident you can raise your Academic Average by at least 10–20 points — roughly one full increment or more on the scale.

Next Steps

Understanding the scale is step one — now find out where you need to land. Read what is a good OAT score to see competitive score tiers and what optometry schools actually expect, then compare your prep options at OAT prep to build the study plan that gets you there.