# Bayes' Theorem Calculator

> Calculates conditional probabilities using Bayes' Theorem formula with detailed observations. (iPhone/iPad app by Global Business Strategies, Inc..)

- Source: https://appshunter.io/ios/app/bayes-theorem-calculator/id1501762787 (this page in markdown: same URL + `.md`)
- Developer: [Global Business Strategies, Inc.](https://appshunter.io/developer/1292082007)
- Category: Education, Business
- Price: $0.99
- Rating: 3.00/5 from 1 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.2 · 1 MB
- Languages: English
- Released: 2020-03-05
- Data updated: 2026-07-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/bayes-theorem-calculator/id1501762787/reviews.md

## What is Bayes' Theorem Calculator?

The Bayes' Theorem Calculator provides a helpful way to determine conditional probabilities using the Bayes' Theorem formula in the format P(A|B)=(P(A)*P(B|A))/P(B).

You are initially requested to input "What is the probability of:" (event A occurring)

"Given that:" (event B has occurred)

The calculator then populates Bayes' Theorem with this information to provide a clear understanding of your problem.

The calculator then asks for the following probability percentages:

    P(A)%
    P(B|A)%
    P(B)%

The calculator then calculates the Bayes' Theorem results.

The calculator also calculates a table of observation percentages that helps with understanding the overall problem structure.  To help verify results, the calculator provides a detailed calculation of the Bayes' Theorem using the included Table of Observation Percentages.

Finally, sample problems are provided to assist you with setting up your problem and input percentages.

## Key features

- Bayes' Theorem calculation
- Conditional probability input
- Table of observation percentages
- Detailed calculation breakdown
- Sample problems included

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/bayes-theorem-calculator/id1501762787/reviews.md

### 3/5 — User interface

*2020-11-10*

Updated review.  Update to iOS 14 was very much appreciated.  UI colors make it hard to read text in boxes and results.  Otherwise it works.  Suggest using system color and dark mode coloring to improve UI and user experience.

**Developer response:** Thanks for your input SamG5V6.  We just updated the app to what we hope are improved contrasting colors.

### 3/5 — Doesn’t appear to work

*2020-04-15*

Doesn’t appear to work

**Developer response:** We are concerned that you cannot get the app to work for you.  It was designed for users who have had exposure to probabilities and Bayes’ Theorem in the hope that it would simplify problem set up and calculations. We suggest that you review the sample problems and enter the sample problem data in the app.  You will find that the calculations are correct.  We have provided a number of sample problems with the app in the hope that they will guide you to set up your particular problem.  As mentioned in the app, the difficulty with applying Bayes’ Theorem is problem set up.  Once you have defined your problem, the calculations are quite simple.  Again, we are sorry that you are having issues and hope this information will help you utilize the app.

## Frequently asked questions about Bayes' Theorem Calculator

### What is Bayes' Theorem Calculator?

Bayes' Theorem Calculator is a paid app designed to help users compute conditional probabilities using the Bayes' Theorem formula. It guides you through inputting necessary probabilities and provides detailed breakdowns and sample problems.

### How does Bayes' Theorem Calculator work?

You input the probability of event A occurring, the probability of event B occurring given A, and the probability of event B occurring. The calculator then uses these values to compute Bayes' Theorem and presents a table of observation percentages for better understanding.

### What are the sample problems in Bayes' Theorem Calculator?

The app includes sample problems to assist users in setting up their own calculations. These examples demonstrate how to input percentages and interpret the results for various scenarios.

### What is the price of Bayes' Theorem Calculator?

Bayes' Theorem Calculator is a paid application priced at $0.99. This one-time purchase grants you access to all its features for calculating probabilities.

### What devices support Bayes' Theorem Calculator?

Bayes' Theorem Calculator is supported on iPhone and iPod devices. It is designed for iOS users looking for a dedicated tool for probability calculations.

### How often is Bayes' Theorem Calculator updated?

The latest version of Bayes' Theorem Calculator is 1.4, last updated on February 2, 2023. This indicates a moderate update frequency, with the developer providing maintenance and improvements.

### What is the age rating for Bayes' Theorem Calculator?

Bayes' Theorem Calculator has an age rating of 4+. This suggests it is suitable for a wide audience, including younger learners, due to its educational and mathematical nature.

### Does Bayes' Theorem Calculator have ads?

No, Bayes' Theorem Calculator does not contain advertisements. As a paid application, it offers an ad-free experience for users focused on learning and calculations.

## Version history (last 5 releases)

### 1.4 — 2023-02-02

Performance updates and bug fixes

### 1.3 — 2020-12-10

IMPROVEMENTS
UI tweaks

FIXED
Various bug fixes and performance improvements

### 1.2 — 2020-11-06

IMPROVEMENTS
UI tweaks

FIXED
Various bug fixes and performance improvements

### 1.1 — 2020-05-15

IMPROVEMENTS
UI tweaks

FIXED
Various bug fixes and performance improvements

### 1.0 — 2020-03-06

No release notes.

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All apps by Global Business Strategies, Inc.: https://appshunter.io/developer/1292082007

## Related topics

[bayes](https://appshunter.io/ios/topics/bayes)

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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 2026-07-05.*