# MathU RPN Calc — Advanced scientific calculator > Advanced scientific, financial, and programmer's calculator using RPN. (iPhone/iPad app by Creative Creek, LLC.) - Source: https://appshunter.io/ios/app/mathu-rpn-calc/id293653078 (this page in markdown: same URL + `.md`) - Developer: [Creative Creek, LLC](https://appshunter.io/developer/293653081) - Category: Finance, Utilities - Price: $24.99 - Rating: 5.00/5 from 117 App Store ratings · 65 written reviews indexed - Age rating: 4+ - Requires: iOS 16.6 · 8 MB - Languages: American English - Released: 2008-10-17 - Data updated: 2026-09-05 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/mathu-rpn-calc/id293653078/reviews.md ## What is MathU RPN Calc? MathU RPN is an advanced scientific and financial calculator designed in the spirit of classic HP calculators. MathU RPN is based on the Reverse Polish Notation (RPN) entry system and combines more than 96 functions to create a calculator that meets the needs of professionals who use a calculator every day. First released in 2008, the calculator continues to be updated with new features as iOS improves. MathU RPN works on the iPhone, iPad and macOS. On the iPad, MathU RPN maintains its orientation as the iPad is turned and you can rotate it from portrait to landscape keypad layout via the Rotate button. When the iPad has a hardware keyboard attached, you can type of the names of the buttons the keyboard to execute them -- thus avoiding having to press the calculator keys with your finger. On the iPhone, you can lock it to always use the portrait or landscape keypad or let it switch orientations automatically when you rotate your phone. MathU RPN is an excellent financial calculator. There are functions for computing mortgage amortization and cash flow computations like IRR and NPV, as well as functions for working with dates. Many of the existing financial functions have been extended to handle odd periods (conforming to the same conventions as the HP-12C). In addition, on tall devices (like most iPhones), the financial registers are displayed on the keypad. MathU RPN is also a programmer's calculator. The A-F keys are available right up front for easy entry in HEX mode and there are many functions for working with integers. Dr. Clay M. Thompson of Creative Creek has harnessed the computational power of the iPhone to produce an accurate and high performance calculator. General Features - IEEE double precision accuracy (16 digits) - High performance fast computations - 20 storage registers - 5 financial registers - 16 high stack (switchable to 4) - Supports international number separators - Switch between portrait and landscape keypads - Quick access to the preference and on-line manual - Stack and Register view (accessible via [RCL][RCL] Scientific Features - Full set of trigonometric functions - Full set of logarithmic and power functions - Statistics functions - Polar and rectangular conversions - Repeated computations Mortgage and Loan Features - Time value of Money functions - Compute mortgage and loan terms - Solve for payments and interest rates - Solve for IRR and NPV - Date functions Computer Science Features - Number bases (HEX, OCT, DEC, BIN) - Bitwise logical operations - Masking and shifting functions - Support for a wordsizes up to 48 bits - Modular arithmetic MathU 4.1 supports iOS 16.6 or higher as well as macOS. For more info (including the users manual) go to http://www.creativecreek.com or use the built-in quick reference. ## Key features - RPN entry system - Over 96 functions - Scientific calculations - Financial calculations (IRR, NPV, mortgage) - Programmer's calculator (HEX, OCT, DEC, BIN) - IEEE double precision accuracy - Portrait/landscape keypad switching ## Chart rankings - #148 in Top Paid · Finance (US App Store) ## Recent user reviews (10 of 65) All indexed reviews: https://appshunter.io/ios/app/mathu-rpn-calc/id293653078/reviews.md ### 5/5 — The best *2026-06-21* I love this app! Why can’t they make a similar app for Windows? ### 5/5 — This is the RPN Calculator to Get *2026-05-07* An old favorite, nay necessity, from my Palm days, I'm very happy to have this essential application for my iPod Touch. It works just like an old school HP Calculator, circa the HP-11 and 12 series, with the added bonus of an extended stack and scientific as well as financial functions. The original for the Palm was programable and there were several program suites that you can add on -- I hope these feature are forthcoming. However, given the excellent execution of this program, it's ease of use, and Creative Creek's very fine customer service, I do not hesitate giving this app 5 stars. Well done! ### 5/5 — Great RPN Calculator! *2026-04-25* Combines scientific and financial functions in the traditional HP style ### 5/5 — Best of the RPN calculators *2026-04-05, version 4.1.3* Does all the scientific calculations and most common financial ones too. Works exactly like the old HP RPN calculators with no quirks. Available on iOS, Android, and OS X. ### 5/5 — Love this calculator! *2026-02-17* This is my daily go-to calculator. It's also my absolute favorite HP emulator! It does everything I need from a calculator. Great combination of functions! Anyone who used the older vintage HPs will appreciate this calculator. Thank you Dr. Thompson for keeping this app current! ### 5/5 — 18 Years Using This Calculator *2026-01-31* I was surprised to see the subtle indication that my go to calculator app had been updated. It’s not the same as my collegiate HP-33E, but better. Do any other apps have this quality and longevity? I doubt it. Never had a single problem with it. Now that it’s also MacOS compatible I can finally put my favorite calculator on my desktop too. ### 5/5 — Absolutely the best *2025-08-25* I've tried several RPN calculator emulators for the iPhone, and this is hands-down the best. It recreates the functions and "feel" of an HP calculator, but doesn't waste space with stupid pictures of the edges of a physical calculator, etc. Worth much more than they charge... ### 5/5 — Wer den HP liebt *2024-04-13* Ich habe die App täglich in Benutzung und liebe sie einfach. Keine Probleme! ### 5/5 — Perfect RPN Calculator *2023-11-25* Originale Umsetzung der HP RPN-Rechner. Ich bin begeistert. Danke für den einmalig guten und schnellen Support. ### 5/5 — Love this calculator! *2023-10-26* This is my daily go-to calculator. It's also my absolute favorite HP emulator! It does everything I need from a calculator. Great combination of functions! Anyone who used the older vintage HPs will appreciate this calculator. Thank you Dr. Thompson for keeping this app current! ## Frequently asked questions about MathU RPN Calc ### What is MathU RPN Calc? MathU RPN Calc is an advanced scientific, financial, and programmer's calculator that uses the Reverse Polish Notation (RPN) entry system. It offers over 96 functions and is designed for professionals who need a powerful and accurate computational tool. ### What kind of calculations can MathU RPN Calc perform? It can perform a wide range of calculations, including full sets of trigonometric, logarithmic, and power functions, statistics, polar and rectangular conversions, mortgage and loan computations (IRR, NPV), date functions, and number base conversions (HEX, OCT, DEC, BIN) with bitwise logical operations for programming. ### Is MathU RPN Calc free to use? Based on the provided information, MathU RPN Calc is a paid application. It does not appear to have in-app purchases or advertisements, indicating a one-time purchase model. ### What devices is MathU RPN Calc compatible with? MathU RPN Calc is compatible with iPhone, iPad, and macOS devices. It supports iOS 16.6 or higher. The app adapts its layout for different screen orientations and can utilize hardware keyboards on iPads. ### Who would benefit from using MathU RPN Calc? This app is ideal for professionals in finance, engineering, and computer science, as well as students and hobbyists who prefer or require the RPN input method for complex calculations. Its extensive function set makes it suitable for daily professional use. ## Version history (last 5 releases) ### 4.1.4 — 2026-05-15 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.4 release fixes a minor layout bug I found after the previous release. Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. ### 4.1.3 — 2026-02-23 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.3 release fixes a few minor bugs I found after I released 4.1.0. Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. ### 4.1.2 — 2026-02-15 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.2 release fixes a few minor bugs I found after I released the last version. Enjoy! Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. ### 4.1.0 — 2026-01-26 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS.   All the calculator functions work.  Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. ### 4.0.2 — 2023-11-20 MathU RPN 4.0.2 adds: - support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator - support for iOS 16.x and iOS 17.x - bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0 - bug fix for random crashes MathU RPN also runs on macOS with Silicon! ## Apps similar to MathU RPN Calc | App | Rating | Price | Category | | --- | --- | --- | --- | | [Calculator with History +](https://appshunter.io/ios/app/calculator-with-history-plus/id1458583388) | 4.7 (24,855) | Free | Finance | | [Calculator X: Math for iPad](https://appshunter.io/ios/app/calculator-x-math-for-ipad/id1198685408) | 4.6 (6,236) | Free | Finance | | [Voice Calculator - Human speak](https://appshunter.io/ios/app/voice-calculator-human-speak/id1299622541) | 4.5 (1,259) | Free | Finance | | [Financial Calculator: Percent](https://appshunter.io/ios/app/financial-calculator-percent/id957134762) | 4.7 (14,664) | Free | Finance | | [10bii Financial Calculator](https://appshunter.io/ios/app/10bii-financial-calculator/id360256797) | 4.7 (662) | $5.99 | Finance | | [Edifito-App](https://appshunter.io/ios/app/edifito-app/id1178977320) | 2.0 (1) | Free | Finance | ## More apps by Creative Creek, LLC - [MathU 12D Financial Calculator](https://appshunter.io/ios/app/mathu-12d-financial-calculator/id379327689) All apps by Creative Creek, LLC: https://appshunter.io/developer/293653081 ## Related topics [rpn calc](https://appshunter.io/ios/topics/rpn-calc) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-05.*