# Standard Deviation Calculate — Statistics average calculator

> Calculates statistical standard deviation for data dispersion analysis. (iPhone/iPad app by 天一 邓.)

- Source: https://appshunter.io/ios/app/standard-deviation-calculate/id1600862053 (this page in markdown: same URL + `.md`)
- Developer: [天一 邓](https://appshunter.io/developer/1056154014)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 4.30/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 11.0 · 5 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2021-12-19
- Data updated: 2026-08-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/standard-deviation-calculate/id1600862053/reviews.md

## What is Standard Deviation Calculate?

In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values.A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range.
Standard deviation may be abbreviated SD, and is most commonly represented in mathematical texts and equations by the lower case Greek letter sigma σ, for the population standard deviation, or the Latin letter s, for the sample standard deviation.

Application examples
The practical value of understanding the standard deviation of a set of values is in appreciating how much variation there is from the average (mean).

Experiment, industrial and hypothesis testing[
Standard deviation is often used to compare real-world data against a model to test the model. For example, in industrial applications the weight of products coming off a production line may need to comply with a legally required value. By weighing some fraction of the products an average weight can be found, which will always be slightly different from the long-term average. By using standard deviations, a minimum and maximum value can be calculated that the averaged weight will be within some very high percentage of the time (99.9% or more). If it falls outside the range then the production process may need to be corrected. Statistical tests such as these are particularly important when the testing is relatively expensive. For example, if the product needs to be opened and drained and weighed, or if the product was otherwise used up by the test.
In experimental science, a theoretical model of reality is used. Particle physics conventionally uses a standard of "5 sigma" for the declaration of a discovery. A five-sigma level translates to one chance in 3.5 million that a random fluctuation would yield the result. This level of certainty was required in order to assert that a particle consistent with the Higgs boson had been discovered in two independent experiments at CERN,also leading to the declaration of the first observation of gravitational waves, and confirmation of global warming.

Weather
As a simple example, consider the average daily maximum temperatures for two cities, one inland and one on the coast. It is helpful to understand that the range of daily maximum temperatures for cities near the coast is smaller than for cities inland. Thus, while these two cities may each have the same average maximum temperature, the standard deviation of the daily maximum temperature for the coastal city will be less than that of the inland city as, on any particular day, the actual maximum temperature is more likely to be farther from the average maximum temperature for the inland city than for the coastal one.

Finance

In finance, standard deviation is often used as a measure of the risk associated with price-fluctuations of a given asset (stocks, bonds, property, etc.), or the risk of a portfolio of assets (actively managed mutual funds, index mutual funds, or ETFs). Risk is an important factor in determining how to efficiently manage a portfolio of investments because it determines the variation in returns on the asset and/or portfolio and gives investors a mathematical basis for investment decisions (known as mean-variance optimization). The fundamental concept of risk is that as it increases, the expected return on an investment should increase as well, an increase known as the risk premium. In other words, investors should expect a higher return on an investment when that investment carries a higher level of risk or uncertainty. When evaluating investments, investors should estimate both the expected return and the uncertainty of future returns. Standard deviation provides a quantified estimate of the uncertainty of future returns.

## Key features

- Calculate standard deviation
- Measure data dispersion
- Understand variation from mean
- Applications in science and finance
- Statistical analysis tool

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 标准差计算器专业版 | $2.99 | one-time |



## Frequently asked questions about Standard Deviation Calculate

### What is Standard Deviation Calculate?

Standard Deviation Calculate is a utility app designed to compute the standard deviation of a given set of values. This statistical measure indicates the amount of variation or dispersion in your data.

### What does standard deviation tell me?

A low standard deviation means your data points are clustered closely around the average (mean). A high standard deviation indicates that your data points are spread out over a wider range.

### What are the practical uses of Standard Deviation Calculate?

The app's functionality is useful for comparing real-world data against models in industrial applications, testing hypotheses in experimental science, and measuring risk associated with price fluctuations in finance.

### Is Standard Deviation Calculate free to use?

Yes, Standard Deviation Calculate is available for free. The app is supported by advertisements, which are integrated into its operation.

### What devices does Standard Deviation Calculate support?

Standard Deviation Calculate is compatible with iPhone, iPad, and iPod devices. It is designed for iOS users.

### How often is Standard Deviation Calculate updated?

The latest version of Standard Deviation Calculate is 1.1, which was released on September 1, 2022. Updates typically address bug fixes and performance improvements.

### What is the age rating for Standard Deviation Calculate?

Standard Deviation Calculate has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### What is the user sentiment for Standard Deviation Calculate?

Based on available data, Standard Deviation Calculate has a rating of 4.3 stars from 3 user reviews. This suggests generally positive user reception.

## Version history (last 5 releases)

### 1.1 — 2022-09-01

bug fixed

### 1.0.3 — 2022-04-09

bug fixed

### 1.0.2 — 2021-12-21

bug fixed

### 1.0.1 — 2021-12-21

bug fixed

### 1.0 — 2021-12-19

No release notes.

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## Related topics

[standard deviation](https://appshunter.io/ios/topics/standard-deviation) · [standard deviation calculator](https://appshunter.io/ios/topics/standard-deviation-calculator)

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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 2026-08-18.*