# John Cominio RPN Calculator

> Scientific RPN calculator with extensive mathematical functions and configurable angle units. (iPhone/iPad app by John Cominio.)

- Source: https://appshunter.io/ios/app/john-cominio-rpn-calculator/id672875842 (this page in markdown: same URL + `.md`)
- Developer: [John Cominio](https://appshunter.io/developer/672764651)
- Category: Productivity, Education
- Price: Free with in-app purchases
- Rating: 4.90/5 from 9 App Store ratings · 5 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 9 MB
- Languages: American English, Arabic, Catalan, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek and 22 more
- Released: 2013-07-23
- Data updated: 2026-08-17
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/john-cominio-rpn-calculator/id672875842/reviews.md

## What is John Cominio RPN Calculator?

Scientific Reverse Polish Notation Calculator.

Supported functions include square root, reciprocal, change sign, sine, cosine, tangent, arc sine, cosine, tangent, hyperbolic sine, cosine, tangent, and arc hyperbolic sine, cosine, and tangent.  Also 10^X, e^X, y^X, X^2, log, natural log, delta percent, pi key, factorial, and nth root keys.

Trigonometric functions also computed in Degrees, Radians, or Gradians.

## Key features

- Reverse Polish Notation (RPN) input
- Comprehensive scientific functions
- Trigonometric calculations (Degrees, Radians, Gradians)
- Exponential and logarithmic functions
- Root and power operations
- Factorial and pi keys

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/john-cominio-rpn-calculator/id672875842/reviews.md

### 5/5 — RPN is the best

*2022-11-21*

Have used this app for years. Very pleased

### 2/5 — Almost!

*2020-05-01*

A very nice looking RPN calculator with some of the most commonly used scientific functions.

In portrait orientation, the calculator fits the screen beautifully. However, although it rotates for landscape view the calculator remains fixed with no change to its dimensions, meaning the bottom of it is not visible and not accessible.

I mostly use my iPad horizontally in its case like a mini-laptop so this unfortunate inconvenience has led to its deletion.

### 5/5 — Myles

*2019-11-15*

Love the RPN (Reverse Polish Notation)!

### 4/5 — Pretty good app but buttons are kind of small

*2017-04-13*

It's a pretty good app that works very well. One thing that I don't like about it is that the buttons are pretty small. On the other hand, it's free. You can't expect a Mercedes for a Hyundai price.

### 5/5 — Nice job

*2014-01-16*

Clean interface. Does it's Job well.

## Frequently asked questions about John Cominio RPN Calculator

### What is RPN calculator?

RPN calculator uses Reverse Polish Notation, an input method where operators follow operands. This differs from standard algebraic notation where operators are placed between operands. It's known for efficiency in complex calculations.

### What scientific functions does John Cominio RPN Calculator support?

It supports square root, reciprocal, sign change, sine, cosine, tangent, arc sine, cosine, tangent, hyperbolic sine, cosine, tangent, arc hyperbolic sine, cosine, tangent, 10^X, e^X, y^X, X^2, log, natural log, delta percent, pi, factorial, and nth root.

### Can I change the angle units for trigonometric functions?

Yes, trigonometric functions can be computed in Degrees, Radians, or Gradians. This allows for flexibility depending on the specific mathematical context or user preference.

### Is John Cominio RPN Calculator available on Android?

Based on the provided data, this calculator is supported on iPhone, iPad, and iPod. There is no information indicating availability on Android devices.

### How often is John Cominio RPN Calculator updated?

The app was last updated on April 24, 2017, with version 1.99. This indicates a less frequent update schedule compared to some other applications.

### What is the user sentiment for John Cominio RPN Calculator?

Users have rated the app highly, with an average of 4.9 stars from 9 ratings. This suggests a very positive reception and satisfaction with its functionality.

### Does John Cominio RPN Calculator have ads?

No, the application does not contain advertisements. It is a free application without any ad interruptions.

### What is the age rating for John Cominio RPN Calculator?

The app has an age rating of 4+. This means it is suitable for users aged 4 and above, with no mature content.

## Version history (last 5 releases)

### 1.99 — 2017-04-24

This app has been updated by Apple to display the Apple Watch app icon.

Optimized iPad layout
Updated for current iOS
Bug fixes

### 1.95 — 2014-04-24

Fixed issue where large (or small) numbers with exponents would overflow the display.

### 1.9 — 2013-12-18

More bug fixes

### 1.8 — 2013-12-11

Fixed bug with decimal entry

### 1.7 — 2013-09-26

Updated for iOS 7.  However, jCalc will still run on iOS 6.
Purchasing the in-app upgrade to remove ads on the iPhone will add an extra row of function keys where the ad banner used to display.

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## More apps by John Cominio

- [Medical Records Tracker](https://appshunter.io/ios/app/medical-records-tracker/id693370911)

All apps by John Cominio: https://appshunter.io/developer/672764651

## Related topics

[john cominio rpn calculator](https://appshunter.io/ios/topics/john-cominio-rpn-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 2026-08-17.*