MathU RPN Calc 4+

Advanced scientific calculator

Creative Creek, LLC

Designed for iPad

    • 5.0 • 23 Ratings
    • $24.99



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.

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 RPN 3.2 has been reformatted to work on the iPhone and iPad. On the iPad, MathU RPN maintains its orientation as the iPad is turned.

MathU RPN 3.2 a great 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.

MathU RPN 3.2 is also a better financial calculator. There are new 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 the iPhone 5 or higher), the financial registers are displayed on the keypad.

The scientific side of MathU RPN has also been improved by adding functions for linear regression as well as computing the percent of total.

MathU 3.2 supports iOS 9.3 or higher.

For more info (including the users manual)
go to or use the built-in quick reference.

What’s New

Version 3.2.2

MathU RPN 3.2.2 adds support for iOS multitasking, iPad split screen and iOS 14 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, fixes for iOS 10.x through 13.x, and other bug fixes (including an issue when using the France region's number separators).

Ratings and Reviews

5.0 out of 5
23 Ratings

23 Ratings

biz217 ,

Really great RPN calculator

I have been using this calculator for years and found it flawless for a RPN calculator. Reverse Polish Notation (RPN) calculators take less keystrokes than an algebraic version to complete a series of calculations.

This calculator faithfully executes the HP look and feel for those wanting combined scientific and business functions in one app. I cannot praise this calculator enough.

Bearcreekmom ,

Love this calculator!

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!

CummingJim ,

Great calculator

Been using for many years. Has surpassed my HP calculator for most purposes, though the H-P works great. RPN is the only way to go for engineering calculations. Learn it and you’ll never touch an arithmetic calculator again j

App Privacy

The developer, Creative Creek, LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

You Might Also Like