# Uncertainty Calculator — Error Propagation

> Calculates error propagation for mathematical expressions with uncertain variables. (iPhone/iPad app by Roman Volinsky.)

- Source: https://appshunter.io/ios/app/uncertainty-calculator/id1170905440 (this page in markdown: same URL + `.md`)
- Developer: [Roman Volinsky](https://appshunter.io/developer/977951850)
- Category: Education, Utilities
- Price: $3.99 (on sale, was $4.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2016-11-01
- Data updated: 2026-08-20
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews.md

## What is Uncertainty Calculator?

Uncertainty Calculator evaluates the error propagation throughout the mathematical expressions comprised of variables of uncertain value.
 
The application allows input of up to three value-error pairs (A, B and C), that can be used as a parameters in the final expression.
 
Error values should be provided in absolute (100 +/- 5) or in relative format, the latter should appear in percent format (100 +/- 5%).
 
The evaluated expression can include numerous functions, that provided by row of the appropriate buttons.
 
Components and functions can be added directly to the expression field by pressing the corresponding buttons. To encompass expression into the preset formula, select the expression and press the corresponding formula button.
 
Particular attention should be paid to placing brackets to avoid equation ambiguity.

The application deals with independent, random errors. So if this is a case never use A + A, but rather 2*A and never A*A*A but rather A^3! Obviously, different parameters can be combined in any way (A+B or C *A^2 .. is perfectly fine).
 
Angles for trigonometric functions can be provided in degrees or radians, and that should be reflected by setting a yellow button to "DEG" or "RAD". Bear in mind the importance of
units in any of calculations!
 
 
Implementation Examples:

1.The charge passing through an electrical circuit is defined by: Q = I * t, where I is the current and t is the time. Calculate the total charge value when a current of 0.15 ± 0.01 A passes through the circuit for 120 ± 1 s:
Input: A = 0.15 ± 0.01, B = 120 ± 1
The final expression will be A*B, and press Calculate:
The final value will be: 18 ± 1.2
Thus, it can be reported the total charge as 18 C ± 1 C.
 
Important! One should only report as many significant figures as are consistent with estimated error! So the value should be rounded to the rightmost decimal place at which error applies.
 
2. A ball is tossed straight up into the air with initial speed vo = (4.0± 0.2) m/s. After a time
t = (0.60 ± 10%) s, the height of the ball is h = vo*t - 0.5gt^2 = 0.636 m (g = 9.80 m/s^2). What is the value and uncertainty of height?

Input: A = vo = 4.0 ± 0.2, and B = t = 0.60 ± 10%, then the final expression should be:
 A*B – 0.5*9.8*B^2
 The final value will be: 0.6 ± 0.4 (meters).

## Key features

- Error propagation calculations
- Absolute and relative error input
- Support for mathematical functions
- Trigonometric calculations (degrees/radians)
- Variable combination in expressions
- Significant figure guidance


## Frequently asked questions about Uncertainty Calculator

### What is the price of Uncertainty Calculator?

Uncertainty Calculator is a paid application priced at $3.99. This one-time purchase grants you access to all its features for error propagation calculations.

### Does Uncertainty Calculator have ads?

No, Uncertainty Calculator does not contain advertisements. As a paid application, it offers an ad-free experience for uninterrupted calculations.

### What devices support Uncertainty Calculator?

Uncertainty Calculator is available for iPhone and iPad devices. It is designed to function on Apple's mobile operating systems.

### How does Uncertainty Calculator handle independent errors?

The application is designed for independent, random errors. For example, it advises using 2*A instead of A + A, and A^3 instead of A*A*A to correctly model independent error propagation.

### Can I input errors in percentage format in Uncertainty Calculator?

Yes, Uncertainty Calculator supports relative error input in percent format. You can enter values like 100 +/- 5% for your variables.

### How often is Uncertainty Calculator updated?

The latest version of Uncertainty Calculator is 3.8, last updated on September 12, 2024. This indicates regular maintenance and potential feature additions.

### What is the age rating for Uncertainty Calculator?

Uncertainty Calculator has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger students learning about scientific calculations.

### How does Uncertainty Calculator help with significant figures?

Uncertainty Calculator emphasizes the importance of reporting results with the correct number of significant figures. It guides users to round their final values to the rightmost decimal place consistent with the estimated error.

## Version history (last 5 releases)

### 3.8 — 2024-09-12

Compatibility update.

### 3.7 — 2023-09-09

Compatibility update.

### 3.6 — 2022-01-20

Compatibility update.

### 3.5 — 2021-06-12

Compatibility update.

### 3.3 — 2021-01-10

Compatibility update.

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## More apps by Roman Volinsky

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All apps by Roman Volinsky: https://appshunter.io/developer/977951850

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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 2026-08-20.*