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RPN Calculator 48

RPN Calculator 48

RPN Scientific Calculator

216 ratings
121 reviews
#181 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 #4 for iPhone
๐Ÿ“‰no. 181
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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
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What users say

Summarized from real user reviews of RPN Calculator 48. Based on 216 reviews and a 4.8/5 average, it highlights the 5 positives and 2 negatives reviewers mention most about this Utilities app.

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 181-16

Utilities

This app dropped -16 positions in Utilities chart.

Last updated on July 22, 2026.

User reviews

Most RecentHighest RatedLowest Rated

Very Good hp 48/49 Emulator

All self respecting engineering school students used the hp (real hp before Compaq merger) 48 and swan song 49 handheld calculators. I am amazed how tell this emulates it. With todayโ€™s dollars the real calculators sold for roughy $4k.
Sailor with Grown DaughtersSailor with Grown Daughters

Goldilocks RPN

This calculator is just the right mix of features/functions from the wonderful 48 series machine. For those fortunate enough to have learned RPN, you can relive that experience every time you are greeted by a need for computation.
WilyWidgetWilyWidget

My Go-To Calculator!!!!

This app is so good that I almost donโ€™t miss my old 48. The haptic feedback upgrade was a great addition. Love that this still works on IOS18.2.
jhgrtyujhgrtyu

Fantastic calculator

This is my go to calculator, and the best RPN calculator app Iโ€™ve tried.
nc-2nc-2

Just works!

Grew up using RPN calculators and this one works well without any fuss. Iโ€™ve used this calculator for years now and use it for any hand calculations I need.
jcc777jcc777
See 116 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.