Find the value at any percentile of a data set, such as the 90th percentile, using linear interpolation. Enter your values; the result updates as you type, with the method shown below.
Formula
Position = (n − 1) × p, then interpolate between the two neighbouring sorted values
Worked example
The 90th percentile of 12 … 40 (10 values) is 35.5.
Frequently asked questions
What does the 90th percentile mean?
90% of values are at or below it.
Is the median a percentile?
Yes, the 50th.
Why do tools give different answers?
Several definitions exist; this one matches Excel PERCENTILE.INC.
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Results are estimates for information only. Check important figures with a professional.