# Calculator RPN — RPN everywhere with you.

> Scientific calculator with RPN for fast, efficient calculations on iOS. (iPhone/iPad app by Benjamin Pisano.)

- Source: https://appshunter.io/ios/app/calculator-rpn/id568690457 (this page in markdown: same URL + `.md`)
- Developer: [Benjamin Pisano](https://appshunter.io/developer/1232617402)
- Category: Utilities, Productivity
- Price: $4.99 (on sale, was $7.99)
- Rating: 4.70/5 from 48 App Store ratings · 45 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 16 MB
- Languages: Canadian French, American English
- Released: 2012-10-17
- Data updated: 2026-08-20
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/calculator-rpn/id568690457/reviews.md

## What is Calculator RPN?

On this calculator you will be able to benefit from all the functions of a scientific calculator and RPN with the new iOS calculator. Thanks to the RPN mode you will be able to calculate sums at great speed which greatly reduces the typing.
With a simple and uncluttered interface design, this calculaor includes 54 mathematical functions such as :
• basic functions like natural logarythms, square roots and factorials
• trigonometry (simple and hyperbolic)
• it convertes polar and rectangular coordinates, decimal hours, hours, minutes and seconds
• it can calculate degrees and radians
And much more

This calculator uses the very efficient and much talked about RPN system used by engineers and scientists, now on iOS.

## Key features

- RPN calculation mode
- 54 mathematical functions
- Trigonometry (simple and hyperbolic)
- Coordinate and unit conversions
- Degrees and radians support
- Simple interface

## Recent user reviews (10 of 45)

All indexed reviews: https://appshunter.io/ios/app/calculator-rpn/id568690457/reviews.md

### 1/5 — Rechnen sollte er schon können.

*2026-01-30, version 4.6.8*

Der sin von 90° ist 0,89. Nicht brauchbar. Zumindest auf der Apple Watch. Schade ums Geld.

### 2/5 — Can’t change decimal places

*2025-03-13*

Can’t reduce decimal places

### 5/5 — Parfait

*2025-01-23*

Interface claire et parfaitement fonctionnelle (notamment avec le pavé numérique, sous Mac OS).

### 3/5 — Trig Function not correct

*2024-10-12*

Used this to build a bracket and discovered Sin45 is not equal to Cos45 according to this calculator. Fortunately I cut it too long not too short! Pretty basic function for a calculator to get wrong!

**Developer response:** Hello, this issue stems from a misunderstanding of the calculator’s settings, which support both radians and degrees. As I explained via email, cos(45°) equals 0.7071, but if the calculator is set to radians, the result will differ. If you’re still experiencing issues, feel free to contact me at contact@snopia.net. The solution is readily available.

Benjamin

### 5/5 — A Pleasure To Use

*2024-03-01*

If there was a prize for most elegant iphone calculator, this would definitely win. No bloat, but all the features you could want, and naturally organized.  The UI is such a simple and thoroughly designed implementation of a touch-screen calculator, not just a phone version of an HP.  I never have to squint or hunt for a function. Everything is as intuitive as it could be.

### 5/5 — excellente calculatrice

*2024-01-12*

Je suis habitué à la notation polonaise inversée, grace à ce petit logiciel je retrouve mes marques.
J'apprécie partculièrement le nombre de lignes qui, à mon avis pourrait être augmenté.

### 1/5 — Settimng the size of the calculator on acreen

*2023-10-24, version 4.6.8*

When this app opens, it takes up far too much of the screen.

This means you have to continually re-size it every time you open it!

It needs a a way to pre-set the size.

A great drawback to what is a useful calculator.

Website and support can't be reached which doesn't help.

### 2/5 — Works but still has problemsorks but still has problems

*2023-05-05*

Functions properly as an RPN calculator that puts an expression under the x register which summarizes the operations.  Nice touch but that's pretty much where it ends.    On computer screen the calculator opens with ridiculously wide buttons in a window that takes up a third of the screen.  Sure it can be resized but next time it opens at maximum size again.  Setting includes option to specify number of decimal places from 15 to 4.  It would be nice if this could be set to 2 for financial calculations, although it's an academic argument since this setting doesn't change anything.

### 5/5 — Easy to use, full featured scientific calculator.

*2022-04-21*

I

### 5/5 — Enfin !

*2022-03-08*

Enfin une calculatrice avec du contenu en français.
Merci de penser que l’on peut avoir des calculatrices qui gère aussi le français dans les paramètres. Également de bonne idée pour la gestion de la pile. Bravo.

## Frequently asked questions about Calculator RPN

### What is Reverse Polish Notation (RPN)?

Reverse Polish Notation (RPN) is a mathematical notation where every operator follows all of its operands. This system, used by this calculator, can significantly speed up calculations by reducing the need for parentheses and simplifying the input process.

### What kind of functions does this calculator offer?

This calculator includes 54 mathematical functions. These range from basic operations like logarithms and square roots to advanced trigonometry (simple and hyperbolic), coordinate conversions, and unit conversions like decimal hours to hours, minutes, and seconds.

### Is this calculator free to use?

Yes, the application is available for free. It does not feature in-app purchases or advertisements, providing an uninterrupted calculation experience.

### What devices is this calculator compatible with?

This calculator is designed for iOS devices. It leverages the capabilities of the iOS platform to offer its scientific and RPN functionalities.

### Who would benefit most from using this calculator?

This calculator is ideal for professionals like engineers and scientists who are familiar with and prefer the efficiency of RPN. It's also beneficial for students and anyone performing complex mathematical calculations who wants a fast and uncluttered tool.

## Version history (last 5 releases)

### 4.6.8 — 2022-04-16

- Minor bug fixes.

### 4.6.7 — 2021-11-07

- Minor bug fixes.

### 4.6.6 — 2021-10-24

- Fixed operation description formatting.
- Fixed rounding that could happen with some operations and settings.

### 4.6.5 — 2021-10-14

- Minor bug fixes.

### 4.6.4 — 2021-09-22

- Support for iOS 15 and watchOS 8.

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## More apps by Benjamin Pisano

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All apps by Benjamin Pisano: https://appshunter.io/developer/1232617402

## Related topics

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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 2026-08-20.*