Best Rpn Calculator Apps

205+ iOS apps curated and reviewed

4.5 avg rating
17 free apps
Updated June 2026

The best rpn calculator apps on iPhone average 4.5β˜… across 205+ titles β€” we've ranked them by what real users actually keep on their phones. Updated June 2026.

Top Picks for Rpn Calculator

iHP48#1

iHP48 by Alexis Lorca

The classic HP48 improved
Editor's Choice
πŸ“Š Productivity
4.7😊(270 ratings)
Free
iHP48 screenshot 1
iHP48 screenshot 2
iHP48 screenshot 3
iHP48 screenshot 4
iHP48 screenshot 5

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.

What We Love

  • πŸš€ Excellent emulation of HP48
  • πŸ‘ Familiar and nostalgic feel
  • πŸ‘ Comprehensive functionality
  • πŸ‘ Customizable skins

Room to Improve

  • πŸ› Occasional crashes or freezes
  • πŸ› Missed keystrokes when typing quickly
  • πŸ› Blank or flickering display
Free42#2

Free42 by Thomas Okken

HP-42S Calculator Simulator
Strong Contender
πŸ”§ Utilities
4.8😊(278 ratings)
Free
Free42 screenshot 1
Free42 screenshot 2
Free42 screenshot 3

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

  • πŸš€ Faithful reproduction of HP42S
  • πŸ‘ Identical to physical calculator
  • πŸ‘ Runs all original programs
  • πŸ‘ Convenient to have on phone

Room to Improve

  • πŸ› Screen not filling entire display on newer devices
  • πŸ”‡ Configurable key click sound missing
  • πŸ”‡ Lack of loud click sound feedback
Retro 15C#3

Retro 15C by Greg Hewgill

Worth Considering
πŸ”§ Utilities
4.3😊(212 ratings)
Free
Retro 15C screenshot 1
Retro 15C screenshot 2

This app emulates a classic RPN scientific calculator, offering advanced features like complex number arithmetic, matrix calculations, and programmability. It provides a functional and complex tool reminiscent of 1980s calculators.

What We Love

  • πŸš€ Lightning-fast calculator
  • πŸ‘ Authentic look and feel of HP 15C
  • πŸš€ Faster than real HP 15C
  • πŸ‘ Excellent RPN emulation

Room to Improve

  • πŸ› Doesn't save settings, programs, or memory
  • πŸ› No key press feedback or sound
  • πŸ› Blinking display issue with large calculations

More Rpn Calculator apps to explore

4
R47 RPN Calculator
R47 RPN Calculator
R47 RPN Calculator
HP Program Editor & Tutorials
Free

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 scientific calculator47-series instruction setProgram editor
πŸ“š Education
(19)
freemium
5
RLM-15CX
RLM-15CX
RLM-15CX
Advance Scientific Calculator
Free

This advanced scientific calculator emulates the functionality of the HP-15C, offering comprehensive tools for finance, business, statistics, and scientific calculations. It supports programming, equation solving, and unit conversions, optimized for iOS devices.

Programmable advanced scientific calculatorFinance and business calculation menusStatistics and probability functions
πŸ“Š Productivity
(13)
free with in-app purchases
6
Touch RPN calc
Touch RPN calc
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
πŸ’° Finance
(207)
free with in-app purchases
7
RPN Calculator 48
RPN Calculator 48
RPN Calculator 48
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
πŸ”§ Utilities
(216)
paid
8
No Equal RPN Calculator
No Equal RPN Calculator
No Equal RPN Calculator
by Stan Corbin
Free

This scientific calculator utilizes Reverse Polish Notation (RPN) for efficient complex calculations, mirroring the functionality of classic HP calculators. It features a continuously visible stack for better tracking and includes 10 memory registers, plus a dedicated quadratic equation solver.

Reverse Polish Notation (RPN)Always visible stack10 memory registers
πŸ”§ Utilities
(7)
ad-supported
9
PCalc Lite
PCalc Lite
PCalc Lite
The Best Calculator
Free

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
πŸ”§ Utilities
(213)
free with in-app purchases
10
Calculatorβ‚Š
Calculatorβ‚Š
Calculatorβ‚Š
Basic, Scientific, Plus Calc
Free

This app offers a comprehensive suite of calculation tools, including basic, scientific, and unit conversion functions. It features an AI-powered math solver that can solve problems from photos and a dedicated math notes section for jotting down equations and diagrams. Accessibility options like dynamic text size and VoiceOver support are also included.

Basic and scientific calculationsUnit and currency converterAI-powered math solver with photo recognition
πŸ”§ Utilities
(1.7M)
free with in-app purchases
11
bcRPN
bcRPN
bcRPN
by Paul Wilkins
Free

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
πŸ”§ Utilities
(4)
free
12
HP-35
HP-35
HP-35
RPN Calculator. HP-35, 45, 21
Free

Emulates classic Hewlett Packard RPN scientific calculators from the 1970s. Experience the original HP-35, HP-45, and HP-21 models on your iPhone.

RPN calculator emulationHP-35 modelHP-45 model
πŸ”§ Utilities
(5)
free
13
Calculator with History +
Calculator with History +
Calculator with History +
No ads & Scientific calculator
Free

This free calculator app offers a fast, ad-free experience with a visual input and calculation history. Customize your experience with various keyboard sounds and colors, and access advanced scientific functions when needed.

Ad-free experienceCalculation historyVisual input
πŸ’° Finance
(23K)
free with in-app purchases
14
Stack RPN Calculator
Stack RPN Calculator
Stack RPN Calculator
by Dario Bersiga
Free

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
πŸ“Š Productivity
(2)
free
15
Calculator RPN
Calculator RPN
Calculator RPN
RPN everywhere with you.
$4.99
$7.99 | 38% OFF

This scientific calculator offers Reverse Polish Notation (RPN) for faster calculations. It includes 54 mathematical functions, coordinate conversions, and unit conversions, all within a simple interface.

RPN calculation mode54 mathematical functionsTrigonometry (simple and hyperbolic)
πŸ”§ Utilities
(45)
free
16
RPN Memory Calculator
RPN Memory Calculator
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
πŸ“š Education
(0)
free
17
DB40X
DB40X
DB40X
High-precision RPL calculator
Free

A high-precision scientific calculator inspired by the HP48 series, offering arbitrary precision computations, complex numbers, vectors, matrices, and graphing. It supports RPN and algebraic operations, with over 1000 built-in functions and a hyperlinked help system.

Arbitrary precision computationsRPN and algebraic operationsComplex numbers, vectors, and matrices
πŸ“Š Productivity
(7)
free
18
The Best Calculator - Calc Pro
The Best Calculator - Calc Pro
The Best Calculator - Calc Pro
10 Powerful Calculators
Free

This app offers a comprehensive suite of 10 powerful calculators and 10 financial worksheets, designed to handle everything from basic arithmetic to complex scientific and financial calculations. It includes features like unit conversion, currency exchange, graphing, and statistical analysis, making it a versatile tool for students and professionals.

10 powerful calculators (Standard, Scientific, Graphing, etc.)10 financial worksheets (Mortgage, Loan, Compound Interest, etc.)Unit Converter with 3000+ conversions
πŸ”§ Utilities
(4.6K)
free with in-app purchases
19
PCalc
PCalc
PCalc
The Best Calculator
$9.99

A powerful calculator designed for professionals and students, offering advanced features like RPN mode, multi-line display, and extensive unit conversions. It supports various number systems and includes an Apple Watch app for on-the-go calculations.

Optional RPN modeMulti-line displayExtensive unit conversions
πŸ”§ Utilities
(758)
free with in-app purchases
20
PowerOne calculator
PowerOne calculator
PowerOne calculator
Finance, scientific, and more
Free

This app offers a powerful calculator with hundreds of pre-built templates for finance, engineering, and more. Users can also create custom calculations for specific needs, ensuring accuracy and speed for repetitive tasks. Access your calculations across devices, online or offline.

Hundreds of pre-built calculation templatesCreate custom calculation templatesStandard and RPN calculator modes
πŸ”§ Utilities
(748)
free with in-app purchases

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