Outlier Calculator

Paste a list of numbers and this tool runs four outlier rules over it at once: Tukey's 1.5 x IQR fences, the plain z-score, the modified z-score built on the median absolute deviation, and Grubbs' test with a real p value. Each value gets its z and its modified z, and every rule's verdict is printed beside the others. The point of showing them together is that they often disagree, because a single large value inflates the standard deviation it is then measured against while the median and the MAD do not move. The mean and standard deviation are also reprinted with the flagged values removed, so you can see how much the answer depends on dropping them.