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RPN Calculator 48

RPN Calculator 48

RPN Scientific Calculator

238 ratings
148 reviews
#199 in paid Utilities
๐Ÿ”ง Utilities
๐Ÿ“Š Productivity
$3.99

Details

  • Released
  • Updated
  • October 30, 2009
  • February 4, 2025

Features

Developer

Tom Kerrigan
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RPN Calculator 48 screenshot #1 for iPhone
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RPN Calculator 48 screenshot #3 for iPhone
RPN Calculator 48 screenshot #4 for iPhone
๐Ÿ“‰no. 199
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Reviews summaryโ†˜๏ธŽ
โญ148
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๐Ÿ”„6+ apps
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โ“5 answered
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About

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.

โœ“Reverse Polish Notation (RPN)
โœ“Scientific calculator functions
โœ“Swipe gestures for undo/redo
โœ“100 entry stack
โœ“6 memory buttons
โœ“State saving on exit
Show original description

What users say about RPN Calculator 48

Reviews of RPN Calculator 48 are mostly positive: the Utilities app is rated 4.8/5 from 238 App Store ratings. What users like most: excellent RPN implementation, familiar and intuitive interface. Top complaints: lack of landscape mode support on iPad, could use more advanced features like matrix operations. Summarized from real user reviews.

Positive things

  • ๐Ÿš€Excellent RPN implementation
  • ๐Ÿ‘Familiar and intuitive interface
  • ๐Ÿ’กUseful features for everyday calculations
  • ๐Ÿš€Reliable and stable performance
  • ๐Ÿ‘Large and visible stack display

Negative things

  • ๐Ÿ›Lack of landscape mode support on iPad
  • ๐Ÿ’กCould use more advanced features like matrix operations
See all reviews

What's New in RPN Calculator 48

1.0.8

February 4, 2025

- Added support for hardware keyboards - Added an option for haptic feedback in the main menu

Charts

Top Paid

๐Ÿ“‰ย 199-23

Utilities

This app dropped -23 positions in Utilities chart.

Last updated on October 12, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Brilliant Calculator

Fantastic calculator for my day-to-day math needs. For years. If youโ€™re accustomed to RPN, require a visual stack size of 10, and all the requisite math functionality, this is a superior calculator app. Big thanks for putting it together.
High Desert ProspectingHigh Desert Prospecting

Fantastic app

Best calculator app Iโ€™ve found! Thank you.
Andy95679Andy95679

Reminds me of my old HP

This is one of my most used apps. I love it.
Scott HaywoodScott Haywood

Long Time RPN User

Iโ€™ve paid a lot of money over the last 30 years for various HP RPN calculators. Some turned out to be collectors items. This is as good or better than those.
Littlebear73Littlebear73

RPN Heaven

I retired my HP35 when I got this app. Itโ€™s so much more efficient doing complex calculations. Love it!
Farnsworth FamilyFarnsworth Family
See 143 more reviews

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User experience

๐Ÿž

Reported Bugs

1 issue

Display issues in landscape mode on iPad

Bug
โœจ

Requested Features

3 requests

Add haptic feedback for key presses

Feature

Implement ability to recall previous calculations from stack

Feature

Improve landscape mode support on iPad

Feature

FAQ

What is RPN Calculator 48?

RPN Calculator 48 is a scientific calculator application that utilizes Reverse Polish Notation (RPN) for calculations. It aims to provide a polished and functional alternative to the default calculator app on your device, inspired by the ergonomics of HP's 48-series calculators.

What are the key features of RPN Calculator 48?

Key features include full scientific calculator functionality, RPN input method, swipe gestures for undo and redo operations, a large and easy-to-read display, a 100-entry stack, 6 memory buttons (A-F), and over 50 levels of undo/redo. The app also saves its state when you exit.

How much does RPN Calculator 48 cost?

RPN Calculator 48 is a paid application. There are no in-app purchases or advertisements within the app, offering a straightforward purchase model for its full functionality.

Is RPN Calculator 48 compatible with my device?

While specific compatibility details are not provided in the description, RPN Calculator 48 is designed for Apple devices, as indicated by its comparison to Apple's calculator app and its developer's other Apple-focused applications. It is likely compatible with recent versions of iOS.

What are common use cases for RPN Calculator 48?

This app is ideal for students, engineers, scientists, and anyone who prefers or requires the RPN input method for complex mathematical and scientific calculations. Its extensive undo/redo features and clear display make it suitable for detailed problem-solving.