Being in the 90th percentile means your score or value is higher than about 90% of the group being measured, and only about 10% are above you. In other words, you’re roughly in the top 10% for whatever is being compared (test score, height, income, etc.).

Simple definition

  • The 90th percentile is the point below which 90% of the data fall, and above which the remaining 10% lie.
  • If you are “in the 90th percentile,” your result is at or better than 90% of the people or values in that dataset.

Everyday examples

  • Test scores: Scoring in the 90th percentile on an exam means you did as well as or better than 90 out of 100 test‑takers; only about 10 scored higher than you.
  • Growth charts for kids: A baby in the 90th percentile for weight is heavier than 90% of babies of the same age and sex, and only 10% weigh more.
  • Salary: A salary at the 90th percentile means 90% of workers in that group earn that amount or less, and 10% earn more, so it shows you’re near the top of the pay range.

Key details and misconceptions

  • Percentile is relative ranking , not raw percentage correct. Scoring in the 90th percentile on a test is different from getting 90% of the questions right; percentile tells you how you did compared to others, not how many you got correct.
  • 50th percentile is roughly average : half are below, half are above; 90th is well above average and near the top.
  • Whether being in a high percentile is “good” depends on what’s measured: high percentile is good for height or test scores, but might be bad for things like waiting time or error rate.

Quick mini-story

Imagine a class of 100 students all taking the same math test. If your score is in the 90th percentile, you’ve outperformed 90 of them and are standing in a small group of just 10 students who scored at or above your level, putting you in the top slice of the class.