How we estimate your DAT score
Since 1 March 2025 the DAT reports scores from 200 to 600 in 10-point steps. The ADA does not publish the table that turns a number of correct answers into that score, so every practice score anywhere is an estimate. This is exactly how ours is made.
1. We account for how hard your test was
Every Natural Sciences and Reading Comprehension question carries a difficulty: the chance that a typical first-time test taker answers it correctly. Seventy percent on a harder test is worth more than seventy percent on an easier one, and a standard psychometric model (Rasch) turns your raw score on that particular test into an ability estimate. Quantitative Reasoning and Perceptual Ability tests are built to the same difficulty mix every time, so they are scored as average difficulty until enough student results exist to measure each question.
2. We place it on the ADA's own numbers
The ability estimate is placed on the mean and standard deviation the ADA published for first-time test takers (DAT User's Manual 2026, tests taken March to December 2025):
| Score | Mean | SD |
|---|---|---|
| Total Science (Survey of Natural Sciences) | 408.7 | 64.6 |
| Biology | 411.4 | 71.8 |
| General Chemistry | 404.9 | 69.2 |
| Organic Chemistry | 409.6 | 70 |
| Perceptual Ability | 410.7 | 70.8 |
| Reading Comprehension | 432.5 | 59 |
| Quantitative Reasoning | 411.1 | 57.3 |
| Academic Average | 413.9 | 54.8 |
3. Percentiles come from the ADA's table
Your percentile is read straight from the ADA's published percentile table (a national sample of more than 30,000 DAT attempts), not from a bell curve we assumed.
4. You get a range, not just one number
A section of 40 to 100 questions cannot pin a score down to 10 points. Each result shows a likely range of one standard error - about ±20 points on Natural Sciences, wider on the 40-question Quantitative Reasoning section. Real test day adds nerves, sleep and luck on top of that.
What we do not know yet
- The starting difficulty of each question is an expert rating. As students take our tests, their first attempts replace those ratings question by question.
- We have not yet compared our estimates with students' official DAT results. Students who have taken the real test can share their official scores; once enough have, we will publish how close we were.
- Only a first attempt at a test is used for calibration; a retake measures memory as much as skill.
Related guides
Common questions
- What scale is the DAT scored on?
- Since 1 March 2025 the DAT reports scores from 200 to 600 in 10-point steps.
- Is a DAT600 practice score an official DAT score?
- No. The ADA does not publish the table that turns correct answers into a 200-600 score, so every practice score is an estimate. Ours accounts for how hard your test was and places the result on the ADA's published means and percentile table.
- How precise is the estimate?
- Each result shows a likely range of one standard error: about plus or minus 20 points on Natural Sciences, and wider on the 40-question Quantitative Reasoning section.
- Have the estimates been checked against real DAT results?
- Not yet. Students who have taken the real test can share their official scores, and once enough have, we will publish how close we were.
Sources: ADA, “Understanding the New DAT Score Reporting Scale” (Table 2, updated 29 January 2025) and the DAT User's Manual 2026 (Table 4). Questions about a score?
DAT is a registered trademark of the American Dental Association. DAT600 is not affiliated with or endorsed by the ADA.