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

It will also return the:
-population deviation
-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.

What’s New

Version 2.1

This app has been updated by Apple to display the Apple Watch app icon.

Fixed some calculation issues with the five number summary.
Small UI changes

Ratings and Reviews

2.3 out of 5
23 Ratings

23 Ratings

Jgmace ,


All was correct except for Q3, please fix.

Captain Klark ,

Crashed after editing a data set

Didn't save. Don't waste your time

Math_Wiz 32 ,


This calculator only does sample standard deviation. (n-1 in the denominator) It should be labeled as such in both the title and the data output

App Privacy

The developer, Keely Hill, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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