Best Rpn Calc Apps

247+ iOS apps curated and reviewed

4.3 avg rating

13 free apps

Updated September 2026

With an average user rating of 4.3★, the rpn calc category is one of the App Store's strongest. Browse all 247+ apps we track, sorted so the most loved ones surface first.

Compare top Rpn Calc Apps (September 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Free42	Free	4.8★ (283)	No	No	Sep 2026
2	R47 RPN Calculator	Free	5.0★ (23)	No	Yes	Sep 2026
3	RPN Calc	$0.99	4.4★ (5)	No	No	Sep 2026
4	MathU RPN Calc	$24.99	5.0★ (117)	No	No	Sep 2026
5	RPN Calculator 48	$3.99	4.8★ (238)	No	No	Sep 2026
6	PCalc Lite	Free	4.4★ (214)	No	Yes	Aug 2026
7	Rpn Calculator SW	Free	—	No	No	May 2026
8	RPN Calculator free	Free	1.0★ (1)	No	No	Aug 2026

Top Picks for Rpn Calc

Free42 by Thomas Okken

HP-42S Calculator Simulator

Editor's Choice

🔧 Utilities

4.8😊(283 ratings)

Free

This application is a faithful re-implementation of the HP-42S scientific calculator and its associated printer. It offers full functionality without requiring original HP ROM images and is an open-source project.

What We Love

🚀 Faithful reproduction of HP42S
👍 Identical to physical calculator
👍 Runs all original programs
👍 Convenient to have on phone
👍 Haptic feedback on button presses
👍 Customizable skins
👍 Actively maintained and updated

Room to Improve

🐛 Screen not filling entire display on newer devices
🔇 Configurable key click sound missing
🔇 Lack of loud click sound feedback

R47 RPN Calculator by MARCEL DAN

HP Program Editor & Tutorials

Strong Contender

📚 Education

5.0(23 ratings)

FreeIn-App Purchases

This scientific calculator uses Reverse Polish Notation (RPN) to help you break down complex problems. It offers a full 47-series instruction set with advanced functions and a program editor. The free version includes extensive tutorials and documentation.

RPN Calc by James Mattis

Worth Considering

🔧 Utilities

4.4(5 ratings)

$0.99

This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.

More Rpn Calc apps to explore

MathU RPN Calc

Advanced scientific calculator

$24.99

This advanced scientific and financial calculator utilizes the Reverse Polish Notation (RPN) system. It offers over 96 functions, catering to professionals with features for finance, programming, and general scientific calculations. Optimized for iOS devices, it provides a robust and accurate computational experience.

RPN entry systemOver 96 functionsScientific calculations

RPN Scientific Calculator

$3.99

This app offers a scientific calculator with Reverse Polish Notation (RPN) functionality, providing an alternative to the default calculator. It features a large, easy-to-read display, a 100-entry stack, and extensive undo/redo capabilities. Its design is inspired by classic HP calculators.

Reverse Polish Notation (RPN)Scientific calculator functionsSwipe gestures for undo/redo

This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.

Optional RPN modeMultiple undo and redoUnit conversions and constants

🔧 Utilities

(214)

free with in-app purchases

This utility app offers a scientific calculator with Reverse Polish Notation (RPN) mode for faster calculations. Its simple interface is designed for engineers and scientists, providing efficient computation on iPhone devices.

Scientific calculator functionsReverse Polish Notation (RPN) modeFast calculation

🔧 Utilities

(1)

free

RePNCalc - RPN Calculator Pro

Easy Reverse Polish Notation

Free

This utility app offers a Reverse Polish Notation (RPN) calculator experience for iOS devices. It features customizable key layouts via swipe gestures and long-press options for stack items. External keyboard support is also available.

Reverse Polish Notation (RPN) inputSwipe gesture key layout customizationLong-press stack item options

🔧 Utilities

(1)

free with in-app purchases

Touch RPN calc

Financial/Sci RPN calculator

Free

This app offers a powerful RPN calculator with financial and scientific functions, mimicking popular industry-standard models. It includes programming capabilities and expandable flavors for diverse calculation needs.

RPN financial calculatorRPN scientific calculatorProgramming functions

💰 Finance

(208)

free with in-app purchases

iHP48

The classic HP48 improved

Free

This app brings the powerful HP48 calculator experience to your mobile device. It offers enhanced performance, seamless file management, and a customizable interface with support for various HP calculator models. Enjoy a familiar and convenient calculator solution without needing extra hardware.

Supports HP38, HP39, HP48, HP49, HP50 calculatorsHaptic feedback and customizable zoom optionsSeamless file transfer via iTunes and Files app

📊 Productivity

(270)

free

RPN Memory Calculator

RPN Multi Function Calculator

Free

This application provides a straightforward reverse Polish notation (RPN) calculator with essential functions and memory operations. It also includes integrated unit conversions for various measurements, allowing for quick conversions directly within the app. The calculator remembers your session, preserving all registers and memory values for future use.

Reverse Polish Notation (RPN) inputSeven core calculator functionsMemory operations

This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.

Visible scientific functionsRPN (Reverse Polish Notation) inputStack display for up to 4 values

📊 Productivity

(2)

free

Enter — RPN Calculator

True four-level stack, undo

A programmable scientific calculator offering a classic aesthetic with modern functionality. It features a dynamic stack display, customizable buttons, and support for multiple data types, making complex calculations intuitive and accessible.

Reverse Polish Notation (RPN) inputDynamic stack display with scrollingCustomizable buttons and programming

📊 Productivity

(34)

paid

RPNConverter: Convert from infix notation to reverse polish notation with the calculator

John Cominio RPN Calculator

by John Cominio

Free

A scientific calculator utilizing Reverse Polish Notation (RPN) for complex calculations. It supports a wide array of mathematical functions including trigonometric, exponential, logarithmic, and root operations, with configurable angle units.

Reverse Polish Notation (RPN) inputComprehensive scientific functionsTrigonometric calculations (Degrees, Radians, Gradians)

This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.

Reverse Polish Notation (RPN) inputComplex number calculationsExtended precision math

A straightforward calculator utilizing Reverse Polish Notation (RPN) for everyday calculations. It offers a four-level visible stack with a total capacity of 100 positions, providing visual feedback on stack fullness. Basic arithmetic operations and stack manipulation functions are included.

Reverse Polish Notation (RPN) inputFour visible stack levels100-position stack capacity

🔧 Utilities

(3)

paid

FAQ about Rpn Calc

What are the best rpn calc apps for iPhone?

Free42 tops our rpn calc apps ranking as of September 2026, with a 4.8-star average from 283 App Store ratings, and it's free to download.

Are there free rpn calc apps for iPhone?

Yes — 13 of the top rpn calc apps we rank are free to download, including Free42 and R47 RPN Calculator.

Does Free42 have ads or in-app purchases?

Free42 has no ads and has no in-app purchases, according to its App Store listing as of September 2026.

How many rpn calc apps are on the App Store?

We track 247+ rpn calc apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.

Best Rpn Calc Apps

Compare top Rpn Calc Apps (September 2026)

Top Picks for Rpn Calc

What We LoveHighlights summarized from real App Store user reviews

Room to ImproveCommon complaints summarized from real App Store user reviews

More Rpn Calc apps to explore

FAQ about Rpn Calc

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What We Love

Room to Improve