What does the 99th percentile mean?

There are numerous places where you may have seen the 99th percentile (ninety-ninth percentile) used. You know that your measurement or score is in the 99th percentile of a group, but do you know what it actually means? The 99th percentile can mean different things and we will start by giving you a couple of examples:

Test Score: This may be the most common place where percentile is used in daily life. If your test score is in the 99th percentile, it means that you scored better than 99 percent of all the test takers. It also means that 1 percent scored the same or better than you.

Growth Chart: A growth chart is often used by pediatricians to show how a child's height, weight, and head circumference compare to other children over time. If your child's height is in the 99th percentile, it means that 99 percent of the children are shorter than your child, and 1 percent of children are the same or taller than your child.

Based on the examples above, this is how we would define the 99th percentile: The 99th percentile means that 99 percent or more is above you and 1 percent is below you. The percentile is a way of illustrating how common your result is compared to others.

Percentile Meaning
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What does the 100th percentile mean?
Here is the next percentile on our list that we have explained for you.

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