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Best Hp Rpn Calculator Apps

211+ iOS apps curated and reviewed

4.6 avg rating
15 free apps
Updated June 2026

The best hp rpn calculator apps on iPhone average 4.6β˜… across 211+ titles β€” we've ranked them by what real users actually keep on their phones. Updated June 2026.

Top Picks for Hp Rpn Calculator

Retro 15C#1

Retro 15C by Greg Hewgill

Editor's Choice
πŸ”§ Utilities
4.3😊(212 ratings)
Free
Retro 15C screenshot 1
Retro 15C screenshot 2

Experience the perfect balance of functionality and complexity with a free scientific calculator app inspired by classic RPN calculators from the 1980s. Includes advanced features like complex number arithmetic, matrix calculations, numerical root finder, statistical functions, and more!

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
HP-35#2

HP-35 by Enrique Haro

RPN Calculator. HP-35, 45, 21
Strong Contender
πŸ”§ Utilities
5.0(5 ratings)
Free
HP-35 screenshot 1
HP-35 screenshot 2
HP-35 screenshot 3
HP-35 screenshot 4
HP-35 screenshot 5

This RPN calculator application emulates the classic Hewlett Packard scientific calculators, including the HP-35, HP-45, and HP-21, as well as the Soviet Π­Π›Π•ΠšΠ’Π ΠžΠΠ˜ΠšΠ MK 61, allowing users to experience the functionality of these iconic calculators. Try it out to perform calculations with ease and nostalgia!

iHP48#3

iHP48 by Alexis Lorca

The classic HP48 improved
Worth Considering
πŸ“Š Productivity
4.7😊(270 ratings)
Free
iHP48 screenshot 1
iHP48 screenshot 2
iHP48 screenshot 3
iHP48 screenshot 4
iHP48 screenshot 5

Introducing iHP48 - The ultimate calculator companion for students and engineers, seamlessly bringing back the iconic HP48 experience to your iPhone. Enjoy enhanced performance, wide compatibility with HP calculators, seamless file management, and a customizable interface for free. Experience the power of the legendary HP48 reinvented for the modern era. Visit https://www.thinkchile.com/iHP48 for more information.

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

More Hp Rpn Calculator apps to explore

4
Free42
Free42
Free42
HP-42S Calculator Simulator
Free

A calculator simulator app that re-implements the HP-42S calculator without needing its ROM image. Open Source project under GNU GPL v2 license. Engage in precise calculations with ease.

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R47 RPN Calculator
R47 RPN Calculator
R47 RPN Calculator
HP Program Editor & Tutorials
Free
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6
RLM-15CX
RLM-15CX
RLM-15CX
Advance Scientific Calculator
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This advanced scientific calculator offers a wide range of functions, including finance, business, statistics, and scientific calculations, with features such as programmable functionality and unit conversions. Try it now with a 30-day free trial and make a one-time purchase for lifetime access.

πŸ“Š Productivity
(13)
7
Touch RPN calc
Touch RPN calc
Touch RPN calc
Financial/Sci RPN calculator
Free

Experience the ultimate financial and scientific RPN calculator with programming functions similar to HP-12C and scientific functions reminiscent of HP-11C. Unlock additional flavors like 10C and 16C within the app.

πŸ’° Finance
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8
RPN Calculator 48
RPN Calculator 48
RPN Calculator 48
RPN Scientific Calculator
$3.99

Experience the efficiency of RPN Calculator 48, a polished RPN Scientific Calculator offering the same functionality as Apple's calculator app with enhanced features like swipe gestures, quick startup, large buttons, and more. Inspired by HP's 48-series calculator, it provides a user-friendly experience for complex calculations.

πŸ”§ Utilities
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The Best Calculator - Calc Pro
The Best Calculator - Calc Pro
The Best Calculator - Calc Pro
10 Powerful Calculators
Free

Experience the ultimate mobile calculator with 10 powerful calculators and financial worksheets, trusted by millions worldwide for its unrivaled accuracy and advanced features. From standard and scientific calculators to unit converters and graphing tools, this app has it all. Get it now for advanced calculations at your fingertips!

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MathU RPN Calc
MathU RPN Calc
MathU RPN Calc
Advanced scientific calculator
$24.99

This advanced scientific and financial calculator is designed for professionals, offering over 96 functions, including mortgage amortization and cash flow computations, and supports various number bases and programming features. With high precision accuracy and fast computations, it provides a comprehensive tool for daily calculations, available on iPhone and iPad devices.

πŸ’° Finance
(87)
11
Calculator⁼
Calculator⁼
Calculator⁼
Fraction, Scientific Calc +
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A handy math assistant for solving basic and scientific calculations intuitively and quickly. Become a math master with this free app!

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Sci:Pro Calculator
Sci:Pro Calculator
Sci:Pro Calculator
by Jerry Montgomery
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A versatile calculator app with Basic, Scientific, and Programmer modes for iPhone, iPad, and iPod Touch. Easily view history and share results via email or copy. Get precise calculations on-the-go!

πŸ”§ Utilities
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13
PowerOne calculator
PowerOne calculator
PowerOne calculator
Finance, scientific, and more
Free
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10bii Financial Calculator
10bii Financial Calculator
10bii Financial Calculator
Easy Financial Calculator
$7.99

A powerful and versatile financial calculator app with over 105 functions for various financial analysis needs, from loan payments to investment values. Perfect for beginners and professionals alike, offering easy-to-use features, intuitive display, and precise mathematics. Answer common financial questions effortlessly with 12 easy modes and visualize cash flows and statistical data with graphs for quick analysis and decision-making.

πŸ’° Finance
(663)
15
RPN-70 SD
RPN-70 SD
RPN-70 SD
Very rare vintage calculator
Free

This financial calculator app is a simulation of a rare 1974 HP-70 calculator, offering functions for loan amortization, saving plans, and depreciation. It features a photo-realistic design, animated keys, and additional benefits like extra storage registers and a popup window for easy register viewing.

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16
Calculator RPN
Calculator RPN
Calculator RPN
RPN everywhere with you.
$4.99
$7.99 | 38% OFF

This scientific calculator brings the efficiency of Reverse Polish Notation (RPN) to iOS, allowing for rapid calculations with a simple and uncluttered interface. With 54 mathematical functions, including trigonometry, logarithms, and coordinate conversion, it enables users to perform complex calculations quickly and easily.

πŸ”§ Utilities
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Calculator with History +
Calculator with History +
Calculator with History +
No ads & Scientific calculator
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A calculator app with a built-in history feature that keeps track of your calculations without any ads. Calculate effortlessly and access your past computations instantly.

πŸ’° Finance
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18
Calculatorβ‚Š
Calculatorβ‚Š
Calculatorβ‚Š
Basic, Scientific, Plus Calc
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Try Calculatorβ‚Š, the ultimate mathematics tool offering basic, scientific, and plus calculations. Ideal for homework, exams, and managing expenses, this app is like having a personal math tutor on your phone. Download now for easy and intuitive math solutions!

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19
RPN-55 SD
RPN-55 SD
RPN-55 SD
Classic HP Calculator w/Timer
$1.99

This application is a photo-realistic simulation of a classic Hewlett-Packard calculator, featuring a 100-hr digital timer, programmable functions, and advanced mathematical operations. Experience the nostalgic look-and-feel of the original calculator, with added extended features and sharing capabilities, and try it out today!

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Color Calculator-smart&cute
Color Calculator-smart&cute
Color Calculator-smart&cute
Cute calculator app with theme
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A color calculator app that helps users find complementary color schemes for design projects. Simply input a base color and let the app generate harmonious color combinations for your projects. Try it now to elevate your design choices!

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