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Standard Deviation Calculator

by Keely Hill more by this developer →

#197,385 of 719,896 by ratings on Apple · #15,073 of 60,382 in Utilities

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Category: Utilities

Description

Use this app to calculate the standard deviation of a set of values.

It will also return the:
-mean(average)
-variance
-population deviation
-Median
-Q1 & Q3

To add a value to the set press "+Row". When all data are in press "Calculate".
Note: Population deviation (n-1) is unbiased, while normal standard deviation (n) is biased.

To calulate the z-score enter a number into the z-score tab, then click find z-score. The z-score will be based off the main table.

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Growth

Change in ratings, scaled to each window from the real gap between crawls. A window needs a full period of history before it reports anything.

History

Tracking since 09/05/2026. History accumulates as changes are observed — check back soon.