If your child's school uses NWEA MAP Growth tests, you have probably received a report showing a "RIT score" and a percentile — and wondered what these numbers actually mean. NWEA MAP is one of the most widely used adaptive assessments in US K–12 education, and the RIT score is genuinely useful information about your child's academic development. This guide explains what MAP tests measure, how to interpret RIT scores, what counts as on track or advanced, and how to use the results to support your child's learning.
What Is the NWEA MAP Growth Test?
NWEA MAP (Measures of Academic Progress) Growth is a computer-adaptive achievement test developed by the Northwest Evaluation Association. It is used by more than 9 million students across the United States in grades K–12, and it measures academic performance in Reading, Mathematics, Language Usage, and (for some grades) Science.
MAP Growth is administered on a computer and adapts in real time — if your child answers a question correctly, the next question is harder; if they answer incorrectly, the next question is easier. This adaptive format means the test is always calibrated to each individual child's level, rather than giving every student the same fixed questions. A third grader and a sixth grader can both take a MAP Reading test, and the test adapts to produce an accurate score for each — without either child facing questions that are uniformly too easy or too hard.
Most schools administer MAP Growth two or three times a year — typically in the fall, winter, and spring. This means you can track not just where your child is, but how quickly they are growing, which is often the most useful piece of information for understanding their academic trajectory.
What Is a RIT Score?
The score MAP Growth produces is called a RIT score (short for Rasch Unit). This is not a percentage and it is not a grade-level equivalent. It is a position on an equal-interval scale that spans the entire K–12 curriculum — the same scale from kindergarten through 12th grade.
A typical kindergartner begins the year with a Math RIT score around 140–150. By the end of 5th grade, the average student is around 210–215. By the end of 10th grade, the average is around 220–225. The scale is continuous and consistent: a RIT score of 210 in Math means exactly the same level of mathematical knowledge whether it belongs to a 4th grader or a 2nd grader.
The key insight about RIT scores:Because the scale is consistent across all grades, you can directly compare a child's RIT score to grade-level norms — and see not just whether they are at grade level, but how far ahead or behind. A 3rd grader with a Math RIT of 220 is performing at a level typical of 6th graders. A 6th grader with a Math RIT of 200 is performing at a level typical of 4th graders.
RIT Score Benchmarks by Grade
The following table shows NWEA's 2020 national norms — the average (mean) RIT scores for US students at the beginning of each grade year, plus what represents strong performance (approximately the 75th percentile).
| Grade | Math (avg) | Math (75th %ile) | Reading (avg) | Reading (75th %ile) |
|---|---|---|---|---|
| K (fall) | 144 | 154 | 139 | 150 |
| Grade 1 (fall) | 163 | 173 | 158 | 170 |
| Grade 2 (fall) | 178 | 188 | 169 | 181 |
| Grade 3 (fall) | 188 | 199 | 177 | 191 |
| Grade 4 (fall) | 197 | 208 | 185 | 199 |
| Grade 5 (fall) | 205 | 216 | 191 | 206 |
| Grade 6 (fall) | 211 | 222 | 197 | 212 |
| Grade 7 (fall) | 215 | 226 | 201 | 217 |
| Grade 8 (fall) | 218 | 229 | 204 | 220 |
Source: NWEA 2020 MAP Growth Norms for Student and School Achievement Status and Growth.
Percentile vs RIT: What's the Difference?
Your child's MAP report shows both a RIT score and a percentile. They measure related but different things.
The RIT score is an absolute measure — it tells you where your child is on the K–12 knowledge continuum, regardless of grade. A RIT of 215 in Math always means the same level of mathematical understanding. It does not change based on what grade your child is in.
The percentileis a relative measure — it compares your child's RIT score to the national norm group for students in the same grade at the same point in the school year. A child in 5th grade with a Math RIT of 220 is at approximately the 80th percentile for 5th graders.
Both are useful, but for different questions. Use the RIT to understand the level of content your child is ready for (what should they be learning next?). Use the percentile to understand how your child compares to peers (is this child working above or below grade level compared to the national average?). For gifted identification, the percentile is the more commonly used metric.
Understanding Growth
One of MAP's most valuable features is growth tracking. NWEA publishes norms not just for status (where is your child now?) but for growth (how much did your child grow?). The typical growth in Math RIT from fall to spring:
- Grades K–2: approximately 10–12 RIT points per year (rapid growth in early literacy and numeracy)
- Grades 3–5: approximately 6–8 RIT points per year (growth slows as content becomes more complex)
- Grades 6–8: approximately 3–5 RIT points per year (growth slows significantly in middle school)
- Grades 9–12: approximately 1–3 RIT points per year (near the ceiling of the scale for advanced students)
A child who grows more than these typical norms — who gains 12 RIT points in Math when the average is 7 — is showing accelerated growth. A child who gains only 2 RIT points in a year when 7 is typical may need additional support in that subject, even if their absolute score is still above grade-level average.
High MAP Scores and Gifted Identification
In many districts, a high MAP Growth score is one of the key indicators that triggers a gifted referral. Common thresholds are the 90th or 95th percentile in one or more subjects. If your child's MAP score is at or above these thresholds, it is worth asking your school explicitly whether a gifted evaluation referral is appropriate. Some districts automatically trigger this process; others require a parent or teacher to initiate it.
If your child scores at the 95th+ percentile on MAP, they are performing at a level significantly above their grade-level peers. This is strong evidence for gifted services — and if your district is not automatically acting on this, it is entirely reasonable to advocate proactively for evaluation. For a full overview of how that evaluation process works and which other tests are used alongside MAP, see our gifted program testing guide.
Low MAP Scores: What to Do
A MAP score below the 25th percentile, or a growth trajectory that is significantly below the norm, suggests your child may need additional academic support. The first step is to speak with your child's teacher to understand whether the MAP result is consistent with classroom performance. MAP is one data point — if classroom performance is strong but MAP scores are low, the discrepancy itself is worth investigating.
Low MAP scores in Reading are often linked to gaps in phonics, fluency, or vocabulary rather than comprehension ability per se. Low MAP scores in Math are often linked to specific topic gaps (fractions, place value, operations) rather than broad mathematical weakness. The MAP Learning Continuum — available to parents through NWEA's website — maps each RIT score range to specific skills, making it possible to identify exactly what to work on.