# RPN Calculus

> Scientific RPN calculator for iPad with advanced functions and a constant database. (iPhone/iPad app by Thomas Braun.)

- Source: https://appshunter.io/ios/app/rpn-calculus/id374359458 (this page in markdown: same URL + `.md`)
- Developer: [Thomas Braun](https://appshunter.io/developer/296553965)
- Category: Utilities, Productivity
- Price: $1.99
- Rating: 4.00/5 from 1 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 11 MB
- Languages: American English
- Released: 2010-06-02
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rpn-calculus/id374359458/reviews.md

## What is RPN Calculus?

RPN Calculus is a scientific RPN Calculator for the Apple iPad. 

RPN Calculus provides basic arithmetic operations as well as advanced mathematic operations like trigonometric, hyperbolic or logarithmic functions. The calculator app provides an unlimited,  well, limited by system resources, amount of memory space for values.

RPN Calculus performs calculations with a precision of up to 15 digits and supports a number range from -1E127 to 1E127. It's  smallest presentable number is 1E-128.

RPN Calculus offers a clean and simple layout, very common if you have used scientific RPN calculators before.

RPN Calculus has a build in constant values database. The database contains over 120 scientific constants of different categories like e.g. Mathematics, Physics or Astronomy. Since the constants database is user extendable, you can add constant values that you are may be missing in the default set of constants.

RPN Calculus can print out your values on the stack and the memory.

## Key features

- RPN (Reverse Polish Notation) interface
- Basic and advanced mathematical functions
- High precision calculations (up to 15 digits)
- Extensive scientific constant database
- User-extendable constant database
- Memory space for values

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/rpn-calculus/id374359458/reviews.md

### 4/5 — Clean and Simple

*2016-08-31*

This is a great App. It is well layed out with all 'common' function keys well located. Can't work out how to change the display from Scientific notation but there must be a way. I wish there was an equivalent for iPhone, it would replace the 42Free App that I have at present. Haven't given it a lot of use but so far so good!

### 4/5 — Very good

*2012-09-26, version 1.6.1*

This is the best RPN calculator available in APP Store. Very clean, easy to use and with 5 row stack. This is not 5 stars because I would like the keyboard keys were a little bit smaller and the display a little bit larger (with larger numbers).
If there were a Solver it would be perfect.

### 4/5 — Elegant

*2010-08-11, version 0*

Calculators are a crowded field. This is a very clean, elegant example; I keep it around with PCalc, which has the advantage of running on iPhone and in portrait mode on iPad.

The new color scheme is IMO a small step backward. Could we please have a setting for the original one? Or perhaps a compromise: the new scheme, but color-on-gray for the red & blue keys; they're just a little too up-front.

## Frequently asked questions about RPN Calculus

### What devices does RPN Calculus support?

RPN Calculus is designed exclusively for the Apple iPad. It offers advanced calculation capabilities optimized for the tablet's interface.

### How much does RPN Calculus cost?

RPN Calculus is a paid application, available for a one-time purchase of $1.99. This grants you access to all its scientific calculation features.

### Does RPN Calculus have ads?

No, RPN Calculus is ad-free. Users can enjoy a distraction-free calculation experience without any advertisements interrupting their workflow.

### What is the precision of calculations in RPN Calculus?

RPN Calculus performs calculations with a high precision of up to 15 digits. It supports a number range from -1E127 to 1E127, with the smallest presentable number being 1E-128.

### How often is RPN Calculus updated?

RPN Calculus was last updated on September 5, 2024, with version 1.8.1. This indicates a commitment to ongoing maintenance and potential feature improvements.

### Can I add my own constants to RPN Calculus?

Yes, the scientific constant database in RPN Calculus is user-extendable. You can add custom constant values that you may need for your specific calculations.

### What is the age rating for RPN Calculus?

RPN Calculus has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger individuals who may be learning mathematics.

### What kind of mathematical functions does RPN Calculus offer?

RPN Calculus provides basic arithmetic operations along with advanced functions such as trigonometric, hyperbolic, and logarithmic operations.

## Version history (last 5 releases)

### 1.8.1 — 2024-09-05

iPad OS specific adjustments and fixes.
General improvements and some UI fixes.
Note: Minimum iPad OS version 12.0.

### 1.8 — 2021-05-10

Newest iPadOS comptability
Printing changed to bigger view
Fixed printing bug, losing the print after selecting a printer

### 1.7 — 2018-01-04

* Bug fixes for iOS 8+
* 64 Bit Version
* Requires iOS 8 or higher

### 1.6.1 — 2012-03-30

- Updated graphics for Retina Display
- Fixed minor bugs when device is rotated

### 1.6 — 2011-12-08

Changes and new features:
- Optional thousand dividers.
- Printing of the stack and memory on AirPrint aware printers.
- Minor Interface Enhancements. 
- Enhancements for better iOS 5 compatibility.

## Apps similar to RPN Calculus

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [\|RPN\| Scientific Calculator](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997) | 2.3 (3) | $0.99 | Utilities |
| [SwiftRPN](https://appshunter.io/ios/app/swiftrpn/id6470951024) | — | Free | Utilities |
| [Codex Calc](https://appshunter.io/ios/app/codex-calc/id505057155) | 4.0 (1) | $0.99 | Utilities |
| [My RPN Calc](https://appshunter.io/ios/app/my-rpn-calc/id807032892) | 3.0 (2) | $1.99 | Utilities |
| [RPNu](https://appshunter.io/ios/app/rpnu/id1195709318) | — | Free | Utilities |
| [Calc Pro HD - Top Calculator!](https://appshunter.io/ios/app/calc-pro-hd-top-calculator/id456661966) | 4.7 (283) | $7.99 | Utilities |

## More apps by Thomas Braun

- [TouchBells](https://appshunter.io/ios/app/touchbells/id378697992)
- [Mind Twist](https://appshunter.io/ios/app/mind-twist/id391098251)
- [Space Guard](https://appshunter.io/ios/app/space-guard/id658493234)

All apps by Thomas Braun: https://appshunter.io/developer/296553965

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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 2026-06-10.*