# Standard Deviation Calculator

> Calculates standard deviation, mean, variance, median, and z-scores for datasets. (iPhone/iPad app by Keely Hill.)

- Source: https://appshunter.io/ios/app/standard-deviation-calculator/id721321543 (this page in markdown: same URL + `.md`)
- Developer: [Keely Hill](https://appshunter.io/developer/1039644107)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 2.40/5 from 24 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 6.1 · 2 MB
- Languages: American English
- Released: 2013-10-15
- Data updated: 2026-06-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/standard-deviation-calculator/id721321543/reviews.md

## What is Standard Deviation Calculator?

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.

## Key features

- Calculate standard deviation
- Calculate mean (average)
- Calculate variance
- Calculate population deviation
- Calculate median
- Calculate Q1 & Q3
- Calculate z-score

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| More Results | Free | one-time |


## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/standard-deviation-calculator/id721321543/reviews.md

### 5/5 — GREAT APP

*2023-02-09, version 2.1*

Not understanding all the negative reviews… great app in my opinion as a stats student

### 1/5 — FFAARRTT

*2021-10-25, version 2.1*

App is poopoo

### 1/5 — Worst app=bad grade😠🤷🏻‍♀️🤷🏻‍♀️🤷🏻‍♀️😭

*2019-10-25, version 2.1*

Worst app. Made me get a 30% in math. Thx diptards.

### 1/5 — Yuck

*2019-01-24, version 2.1*

Why make such a terrible app?

### 1/5 — Terrible

*2018-12-18, version 2.1*

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

### 1/5 — Giey

*2018-10-15, version 2.1*

Giey, gay, giieyyyy

### 2/5 — Student

*2017-09-19, version 2.1*

All was correct except for Q3, please fix.

### 1/5 — Crashed after editing a data set

*2017-09-16, version 2.1*

Didn't save. Don't waste your time

### 5/5 — 10/10

*2016-08-20, version 2.0*

Okay, I never write reviews but this app I think has changed my life and the fact that it is free makes it 100 times better. I doesn't just do standard deviation but so much more! I would recommend this to anyone with a lot of math that they don't want to do by hand

### 1/5 — Keeps Crashing

*2016-07-26, version 2.0*

Every time I go back to edit or delete a number/item the app closes forcing me to start over. Very inconvenient. If it that didn't happen I'd give the app 5 stars.

## Frequently asked questions about Standard Deviation Calculator

### What statistical measures can Standard Deviation Calculator compute?

Standard Deviation Calculator can compute the standard deviation, mean (average), variance, population deviation, median, Q1 & Q3, and z-scores for your datasets.

### How do I add data to Standard Deviation Calculator?

To add a value to the dataset in Standard Deviation Calculator, simply press the "+Row" button for each entry. Once all your data is entered, tap "Calculate".

### What is the difference between population deviation and normal standard deviation in Standard Deviation Calculator?

The app notes that population deviation uses (n-1) and is unbiased, while normal standard deviation uses (n) and is biased. This distinction is important for accurate statistical analysis.

### Can Standard Deviation Calculator calculate z-scores?

Yes, Standard Deviation Calculator has a dedicated z-score tab. You can enter a number there and click "Find z-score" to calculate it based on the main dataset.

### What devices is Standard Deviation Calculator compatible with?

Standard Deviation Calculator is available for iPhone, iPad, and iPod devices.

### When was Standard Deviation Calculator last updated?

The latest version of Standard Deviation Calculator was released on September 5, 2016, with version number 2.1.

### What is the user rating for Standard Deviation Calculator?

Standard Deviation Calculator has a rating of 2.4 stars based on 24 ratings.

### Is Standard Deviation Calculator free to use?

Yes, Standard Deviation Calculator is free to download and use. It also offers in-app purchases.

## Version history (last 5 releases)

### 2.1 — 2016-09-05

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

### 2.0 — 2016-02-03

* Scrolling and auto scrolling greatly improved.
* Better keypad awareness.
* Improved handling of empty rows.
* No longer must you manually delete them by swiping, but it is still a option.
* Updated app icon.
+ Support for larger screen sizes.
+ First row is added for you for quickly stating input.
+ iPad 'enter' key relabeled as next and adds a row too.
* Other smaller fixes and improvements.
* 2.0 Version Bump

### 1.3 — 2014-01-07

+New, clean design.
+New 'Results' screen, leaves more space for the set.
+More calculations, including:
    •Q1 & Q3
    •Median
    •Min & Max
    
*Fixed: could not get out of z-score screen.
*z-score is more accurate
*Changed the purchase window.
*Easier to scroll.

### 1.2 — 2013-12-03

+Option to remove advertisements.
*Fixed the crash when background is tapped.
*Fixed the mean not registering correctly.

### 1.1 — 2013-11-01

+Now find the z-score of the data in the table.
*Changed launch image.

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## More apps by Keely Hill

- [Tile Slide!](https://appshunter.io/ios/app/tile-slide/id1071732456)
- [Quick Voice Memo](https://appshunter.io/ios/app/quick-voice-memo/id1150524785)
- [Storyboard Animator](https://appshunter.io/ios/app/storyboard-animator/id1326518944)

All apps by Keely Hill: https://appshunter.io/developer/1039644107

## Related topics

[HOW TO CALCULATE STANDARD DEVIATION FROM 10 TESTS](https://appshunter.io/ios/topics/how-to-calculate-standard-deviation-from-10-tests) · [standard deviation calculator](https://appshunter.io/ios/topics/standard-deviation-calculator) · [standard deviation](https://appshunter.io/ios/topics/standard-deviation)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-07.*