About this tool
The Percentile Calculator turns a list of numbers into percentiles two ways: it can find the value at a percentile you choose, or the percentile rank of a value you enter. Paste your data separated by commas, spaces or newlines; it sorts them and computes everything locally in your browser.
To find a value it uses the inclusive linear-interpolation method (the same as spreadsheet PERCENTILE.INC): rank = (p/100)·(n − 1), then value = sorted[⌊rank⌋] + frac·(sorted[⌊rank⌋+1] − sorted[⌊rank⌋]), where frac is the fractional part of rank. To find a rank it uses the "below plus half-equal" definition: percentile rank = (count of values below v + 0.5·count of values equal to v) / n × 100.
Alongside the requested result it always reports the quartiles Q1 (25th), median (50th) and Q3 (75th) using the same interpolation, plus the minimum and maximum. Finding a percentile value needs at least two data points so interpolation is defined; a single value is enough to look up a rank.