# Calculate Bayes' Theorem

> Calculate Bayes' Theorem (iPhone/iPad app by Kameron Young.)

- Source: https://appshunter.io/ios/app/calculate-bayes-theorem/id6763904843 (this page in markdown: same URL + `.md`)
- Developer: [Kameron Young](https://appshunter.io/developer/1798994336)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 18.6 · 1 MB
- Languages: English
- Released: 2026-04-28
- Data updated: 2026-05-08
- User reviews in markdown: https://appshunter.io/ios/app/calculate-bayes-theorem/id6763904843/reviews.md

## What is Calculate Bayes' Theorem?

Bayes' Theorem Calculator

Calculate posterior probabilities with an intuitive, purpose-built calculator. Whether you're a student learning Bayesian reasoning, a clinician interpreting test results, or anyone who wants to update beliefs with evidence, this app makes it straightforward.

Three Calculator Modes

• Basic — Enter P(A), P(B), and P(B|A) to compute P(A|B) directly from Bayes' Theorem.
• Medical Test — Input prevalence, sensitivity, and specificity to find the probability of disease given a positive or negative result. Supports both prevalence-based and positive-rate-based calculations.
• Odds Form — Work with prior probability and likelihood ratios to update beliefs, ideal for sequential reasoning.

Step-by-Step Breakdowns

Every result includes a detailed breakdown showing exactly how each value was calculated — no black boxes.

Chain Multiple Tests

Use the result of one calculation as the prior for the next with a single tap. Perfect for interpreting sequential medical tests or compounding evidence.

Built-In Reference Guide

A comprehensive info section covers:
• Key terms and definitions
• Sensitivity and specificity explained
• A worked medical test example with full notation
• The odds form of Bayes' Theorem
• How to chain tests using likelihood ratios
• Key takeaways for Bayesian thinking


## Version history (last 1 release)

### 1.0 — 2026-04-28

No release notes.

## More apps by Kameron Young

- [Pearl Dragon Mahjong](https://appshunter.io/ios/app/pearl-dragon-mahjong/id6742565264)
- [Ranked Choice Voting](https://appshunter.io/ios/app/ranked-choice-voting/id6748663139)

All apps by Kameron Young: https://appshunter.io/developer/1798994336

## 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 2026-05-08.*