---
title: "RPN Calc - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch!  If you are familiar with HP RPN calculators, the operation of this calculat"
---

# RPN Calc — United States

![RPN Calc App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/65/0c/4f/650c4f8c-4e56-a7c8-1927-2a291b67d207/AppIcon-0-0-1x_U007epad-0-1-85-220.png/400x400bb.png)

**Developer:** [James Mattis](https://apptail.io/developer/james-mattis-PIH)
**Category:** Utilities
**Rating:** 4.0/5 (6 ratings)
**Price:** $0.99
**Bundle ID:** com.yourcompany.RPNCalc
**Store:** Apple App Store
**Country:** United States
**Version:** 13.1.0 (released 2026-08-13)
**Original Release:** 2019-01-31

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id285002799)
**AppTail Page:** [https://apptail.io/app/rpn-calc-hUnd/united-states](https://apptail.io/app/rpn-calc-hUnd/united-states)

## RPN Calc Description
A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch!

If you are familiar with HP RPN calculators, the operation of this calculator should seem very straightforward - albeit simplified. It can't be programmed, and it doesn't handle binary, or hexadecimal numbers. 

But, it has a clean, simple interface with large, easy to press buttons. It has all of the functions required for quick calculations when your iPhone is handier than your computer or calculator.

And, remember those cool calculator watches from the 1980s? Unfortunately, none of them were RPN. RPN Calc brings a reverse polish notation watch calculator to the Apple Watch!

In addition to the standard RPN Calculator app that runs on iPhone, iPad, and Apple Watch, RPN Calc includes a handy micro RPN Calc Today Extension available for convenient access to quick calculations from the pull down Today screen.

## RPN Calc Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3a/c5/f2/3ac5f266-b183-7629-ac1c-0d89f196c32f/381d70ff-d20d-4175-ba2b-ed77ce3e8756_iPhone_6_9_0.png/1320x2868.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2f/da/3c/2fda3c81-600b-4b1c-401f-249a2f74e552/c60e885a-376e-450c-b491-fadcca0a3242_iPhone_6_9_1.png/1320x2868.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3a/c8/02/3ac80284-ce4c-c6db-b2e4-d206d13fd620/652ac028-c662-4d2f-9dac-ebcc7c9bd5de_iPhone_6_9_2.png/1320x2868.png)

## RPN Calc Rating Breakdown in United States
- 5 stars: 2 (33%)
- 4 stars: 3 (50%)
- 3 stars: 0 (0%)
- 2 stars: 1 (17%)
- 1 stars: 0 (0%)

## RPN Calc Reviews in United States

### ****- "Clean Design... But need one one thing"
Nice layout. Works well but needs one more thing. 

It is very necessary to have an x(exchange)y function on the keyboard. 

Many calculations need this capability to set up for a solution as RPN uses the x-y order for them....

Please add this to an update if you can.
-- Eyekazoo, 2017-11-05

### ****- "Close to perfect"
I love this for my watch it it could really use square root key
-- paco_the_great, 2016-01-13

### ****- "Works well on Watch and Widget"
I have always liked RPN calculators more than algebraic. This is a fairly simple RPN calculator that works surprisingly well as a widget but also on the Apple Watch. It has a four level stack. It does have an unusual behavior where if the stack is full and you add up all the numbers the number that was on the top of the stack is repeated ad infinitum in the Y position. If you pay attention to what you're doing this should not cause a problem but I found it odd. I would like to see instructions included as well as sound effects in the widget so that when I press on the key there is a click or tone.
-- joemeyer, 2015-08-02

### **--- "Has problems"
Not full screen. Keys are small.
Background around calculator bright white making it hard to see. Background should be black or calculator should be full screen.
-- knight2hug, 2014-11-15

### ****- "Good Basic RPN Calculator"
Simple RPN calculator that keeps me from having to reach for my 30 year old HP-11C most of the time.  The ability to do unit conversions is worth the price by itself.
-- Steel is Real, 2011-07-27

[View all RPN Calc reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)


## RPN Calc Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | United States | Utilities | #164 |


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## RPN Calc Available In
- [United States](https://apptail.io/app/rpn-calc-hUnd/united-states)
- [Germany](https://apptail.io/app/rpn-calc-hUnd/germany)
- [Japan](https://apptail.io/app/rpn-calc-hUnd/japan)
- [Austria](https://apptail.io/app/rpn-calc-hUnd/austria)
- [Spain](https://apptail.io/app/rpn-calc-hUnd/spain)
- [France](https://apptail.io/app/rpn-calc-hUnd/france)
- [Sweden](https://apptail.io/app/rpn-calc-hUnd/sweden)
- [Canada](https://apptail.io/app/rpn-calc-hUnd/canada)
- [Italy](https://apptail.io/app/rpn-calc-hUnd/italy)
- [Slovakia](https://apptail.io/app/rpn-calc-hUnd/slovakia)
- [Switzerland](https://apptail.io/app/rpn-calc-hUnd/switzerland)
- [Netherlands](https://apptail.io/app/rpn-calc-hUnd/netherlands)
- [Norway](https://apptail.io/app/rpn-calc-hUnd/norway)
- [New Zealand](https://apptail.io/app/rpn-calc-hUnd/new-zealand)
- [Australia](https://apptail.io/app/rpn-calc-hUnd/australia)
- [United Kingdom](https://apptail.io/app/rpn-calc-hUnd/united-kingdom)
- [Belgium](https://apptail.io/app/rpn-calc-hUnd/belgium)
- [Greece](https://apptail.io/app/rpn-calc-hUnd/greece)
- [Hong Kong SAR China](https://apptail.io/app/rpn-calc-hUnd/hong-kong)
- [Hungary](https://apptail.io/app/rpn-calc-hUnd/hungary)
- [Indonesia](https://apptail.io/app/rpn-calc-hUnd/indonesia)
- [Ireland](https://apptail.io/app/rpn-calc-hUnd/ireland)
- [Israel](https://apptail.io/app/rpn-calc-hUnd/israel)
- [India](https://apptail.io/app/rpn-calc-hUnd/india)
- [South Korea](https://apptail.io/app/rpn-calc-hUnd/south-korea)
- [Kuwait](https://apptail.io/app/rpn-calc-hUnd/kuwait)
- [Kazakhstan](https://apptail.io/app/rpn-calc-hUnd/kazakhstan)
- [Lebanon](https://apptail.io/app/rpn-calc-hUnd/lebanon)
- [Sri Lanka](https://apptail.io/app/rpn-calc-hUnd/sri-lanka)
- [Luxembourg](https://apptail.io/app/rpn-calc-hUnd/luxembourg)
- [Mexico](https://apptail.io/app/rpn-calc-hUnd/mexico)
- [Malaysia](https://apptail.io/app/rpn-calc-hUnd/malaysia)
- [Nigeria](https://apptail.io/app/rpn-calc-hUnd/nigeria)
- [Peru](https://apptail.io/app/rpn-calc-hUnd/peru)
- [Philippines](https://apptail.io/app/rpn-calc-hUnd/philippines)
- [Pakistan](https://apptail.io/app/rpn-calc-hUnd/pakistan)
- [Poland](https://apptail.io/app/rpn-calc-hUnd/poland)
- [Portugal](https://apptail.io/app/rpn-calc-hUnd/portugal)
- [Romania](https://apptail.io/app/rpn-calc-hUnd/romania)
- [Russia](https://apptail.io/app/rpn-calc-hUnd/russia)
- [Saudi Arabia](https://apptail.io/app/rpn-calc-hUnd/saudi-arabia)
- [Singapore](https://apptail.io/app/rpn-calc-hUnd/singapore)
- [Slovenia](https://apptail.io/app/rpn-calc-hUnd/slovenia)
- [Thailand](https://apptail.io/app/rpn-calc-hUnd/thailand)
- [Türkiye](https://apptail.io/app/rpn-calc-hUnd/turkey)
- [Taiwan](https://apptail.io/app/rpn-calc-hUnd/taiwan)
- [Ukraine](https://apptail.io/app/rpn-calc-hUnd/ukraine)
- [Vietnam](https://apptail.io/app/rpn-calc-hUnd/vietnam)
- [United Arab Emirates](https://apptail.io/app/rpn-calc-hUnd/united-arab-emirates)
- [South Africa](https://apptail.io/app/rpn-calc-hUnd/south-africa)
- [Armenia](https://apptail.io/app/rpn-calc-hUnd/armenia)
- [Argentina](https://apptail.io/app/rpn-calc-hUnd/argentina)
- [Azerbaijan](https://apptail.io/app/rpn-calc-hUnd/azerbaijan)
- [Brunei](https://apptail.io/app/rpn-calc-hUnd/brunei)
- [Brazil](https://apptail.io/app/rpn-calc-hUnd/brazil)
- [Belarus](https://apptail.io/app/rpn-calc-hUnd/belarus)
- [Chile](https://apptail.io/app/rpn-calc-hUnd/chile)
- [China](https://apptail.io/app/rpn-calc-hUnd/china)
- [Colombia](https://apptail.io/app/rpn-calc-hUnd/colombia)
- [Czechia](https://apptail.io/app/rpn-calc-hUnd/czechia)
- [Denmark](https://apptail.io/app/rpn-calc-hUnd/denmark)
- [Dominican Republic](https://apptail.io/app/rpn-calc-hUnd/dominican-republic)
- [Algeria](https://apptail.io/app/rpn-calc-hUnd/algeria)
- [Ecuador](https://apptail.io/app/rpn-calc-hUnd/ecuador)
- [Egypt](https://apptail.io/app/rpn-calc-hUnd/egypt)
- [Finland](https://apptail.io/app/rpn-calc-hUnd/finland)

---

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