# Probability Calculator Plus — Stats, Distributions & Venn

> Comprehensive probability and statistics calculator with step-by-step solutions. (iPhone/iPad app by Heng Jia Liang.)

- Source: https://appshunter.io/ios/app/probability-calculator-plus/id1625628315 (this page in markdown: same URL + `.md`)
- Developer: [Heng Jia Liang](https://appshunter.io/developer/1532000635)
- Category: Education, Utilities
- Price: $2.99
- Rating: 3.70/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2022-05-23
- Data updated: 2026-08-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/probability-calculator-plus/id1625628315/reviews.md

## What is Probability Calculator Plus?

Master probability and statistics with Probability Calculator — the most complete probability calculator for students, teachers, and data enthusiasts.

Whether you're studying for an exam, teaching a class, or working through real-world statistics problems, ProbCalc gives you instant answers with full step-by-step solutions so you truly understand the math.

- PROBABILITY CALCULATIONS -
• Basic Probability — Calculate P(A) from favorable and total outcomes
• Conditional Probability — Solve P(A|B) = P(A∩B) / P(B)
• Independent Events — Multiply probabilities across multiple events
• Dependent Events — P(A∩B) = P(A) × P(B|A)
• Venn Diagram Calculator — Input P(A) and P(B), instantly get P(A∩B), P(A∪B), P(A XOR B), and occurrence probabilities over N trials — complete with visual Venn diagram
• Custom Calculator — Enter values as fractions, decimals, or percentages

- STATISTICAL DISTRIBUTIONS -
• Binomial Distribution — P(X=k), mean, variance, and standard deviation
• Normal Distribution — P(a ≤ X ≤ b) with z-score computation and CDF
• Poisson Distribution — P(X=k) with λ parameter, mean, and variance

-RANDOM EXPERIMENT SIMULATOR -
Roll dice, flip coins, and draw cards — all with real probability charts:
• Dice: D4, D6, D8, D10, D12, D20 (roll up to 6 at once)
• Coins: Flip 1–10 coins simultaneously
• Cards: Draw from a standard 52-card deck
• Live frequency chart updates with every trial

- STEP-BY-STEP SOLUTIONS -
Every calculation shows the full working — formula, substitution, and result. Perfect for checking homework, preparing for exams, or learning how probability really works.

- CALCULATION HISTORY -
Every result is automatically saved. Search, review, and copy any previous calculation. Swipe to delete. Tap for full detail with all steps.

-REFERENCE GUIDE -
Built-in reference includes:
• Complete probability and distribution formulas
• Standard Normal Z-table (z = −3.0 to +3.0)
• Interactive combinations C(n,r) and permutations P(n,r) calculator

- DESIGNED FOR EVERYONE -
Clean, distraction-free interface with full Dark Mode support. Tap any result to copy it instantly. Works on iPhone and iPad.
No ads. No subscriptions. No internet required.

Perfect for:
• High school and university statistics courses
• AP Statistics, IB Math, A-Level, SAT/ACT prep
• College probability and statistics classes
• Teachers preparing lessons and examples
• Data analysts and business professionals

Probability is the measure of the likelihood that an event will occur. Probability is quantified as a number between 0 and 1, where, loosely speaking, 0 indicates impossibility and 1 indicates certainty.

Summary of probabilities:
Probability that both the events occur P(A ∩ B) = P(A) x P(B).
Probability that either of event occurs P(A U B) = P(A) + P(B) - P(A ∩ B).
Conditional Probability P(A | B) = P(A ∩ B) / P(B).
Conditional Probability P(B | A) = P(A ∩ B) / P(A).
Exclusive OR of A and B P(A XOR B) = P(A) + P(B) - 2 X P(A ∩ B).

Probability theory is used widely in such areas of study as mathematics, statistics, finance, gambling, science (in particular physics), artificial intelligence/machine learning, computer science, game theory, and philosophy to, for example, draw inferences about the expected frequency of events.

Probability theory is applied in everyday life in risk assessment and modeling. The insurance industry and markets use actuarial science to determine pricing and make trading decisions. Governments apply probabilistic methods in environmental regulation, entitlement analysis (Reliability theory of aging and longevity), and financial regulation. 

Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

## Key features

- Basic and conditional probability calculations
- Venn diagram calculator with visual representation
- Statistical distributions (Binomial, Normal, Poisson)
- Random experiment simulator (dice, coins, cards)
- Step-by-step solutions for all calculations
- Calculation history and reference guide


## Frequently asked questions about Probability Calculator Plus

### What is Probability Calculator Plus used for?

Probability Calculator Plus helps users master probability and statistics by providing instant answers with full step-by-step solutions. It's designed for students, teachers, and data enthusiasts to understand mathematical concepts better.

### Does Probability Calculator Plus offer step-by-step solutions?

Yes, every calculation in Probability Calculator Plus shows the full working, including the formula, substitution, and result. This feature is ideal for checking homework or learning how probability works.

### What statistical distributions can Probability Calculator Plus calculate?

Probability Calculator Plus supports calculations for Binomial Distribution (P(X=k), mean, variance, standard deviation), Normal Distribution (P(a ≤ X ≤ b) with z-score computation and CDF), and Poisson Distribution (P(X=k) with λ parameter, mean, and variance).

### Can Probability Calculator Plus simulate random experiments?

Yes, Probability Calculator Plus includes a random experiment simulator where you can roll dice (D4, D6, D8, D10, D12, D20), flip coins (1–10 simultaneously), and draw cards from a standard 52-card deck, all with live frequency charts.

### What is the price of Probability Calculator Plus?

Probability Calculator Plus is a paid application, priced at $2.99. There are no subscriptions or in-app purchases required after the initial purchase.

### Does Probability Calculator Plus have ads?

No, Probability Calculator Plus is ad-free. The description explicitly states 'No ads. No subscriptions. No internet required.'

### What devices is Probability Calculator Plus compatible with?

Probability Calculator Plus is designed for both iPhone and iPad. It features a clean interface with full Dark Mode support for a comfortable user experience on Apple devices.

### How often is Probability Calculator Plus updated?

The latest version of Probability Calculator Plus is 1.5, last updated on March 23, 2026. While this indicates a recent update, the frequency of future updates is not specified.

## Version history (last 3 releases)

### 1.5 — 2026-03-23

- Optimized for the latest devices.
- Fixed minor bugs.
- Improved and redesigned the UI.

### 1.1 — 2025-06-30

- Updated for the newest devices.
- Minor bugs fixed.

### 1.0 — 2022-05-23

No release notes.

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All apps by Heng Jia Liang: https://appshunter.io/developer/1532000635

## Related topics

[probability calculator plus](https://appshunter.io/ios/topics/probability-calculator-plus)

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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 2026-08-01.*