The classic RPN financial keyboard with keystroke programs, plus more than 30 worksheets for finance, business, statistics and science. Try everything free for 30 days.
The RLM-12CX is a programmable RPN calculator with a special focus on finance and business. It keeps the classic financial keyboard you already know and its keystroke programming, and adds a complete set of menus and worksheets designed to bring up the most of your iPhone and iPad.
>Keyboard:
•RPN entry with a four-level stack, LAST X and storage registers.
•Time value of money, amortization, NPV, IRR, bond price and yield, SL, SOYD and DB depreciation, dates, percentages and statistics directly from the keys.
•Keystroke programs with conditional tests and branches, written in a full-screen editor and saved and loaded by name.
>Finance Worksheets:
•Account Balance: Calculates the balance of cash transactions and interest applied at arbitrary dates.
•Loan Amortization: Amortization schedule for a single payment or several payments at once.
•Bonds Price & Yield: Calculates the price, yield and effective duration of a bond.
•Black-Scholes Options: Calculates the CALL, PUT and “Greeks” values of a Black-Scholes European option.
•Depreciation: Calculates depreciation with SL, SOYD, DB or MACRS methods.
•Interest Conversion: Nominal and effective interest conversion.
•Time Value of Money: Calculates compound interest problems.
>Business Worksheets:
•Bill-Tip-Split: Calculates the sharing of a bill with tip.
•Break Even: Analyzes the relation Profit = (Price - Var.Cost) • Units - Fix.Cost
•Currency Exchange with manual or on-line rates.
•Inventory Turn Over.
•Percents & Margins: Calculates %Change, %Total and business margins.
•Return on Investment.
>Cash Flows Worksheets:
•Equal Periods: NPV, IRR, MIRR, NFV, payback and discounted payback of cash flows occurring at regular time intervals.
•Unequal Periods: Cash flows occurring at arbitrary dates.
>Statistics Worksheets:
•Probability: 16 probability distributions.
•(X,N)-List Statistics: One-variable statistics.
•(X,Y)-List Statistics: Two-variable statistics and curve fitting.
>Scientific Worksheets:
•Angles & Polar-Rectangular conversions.
•Combinations & Permutations.
•Logarithms, Trigonometric, Hyperbolic and Number Alteration functions.
•Quadratic Equation solver.
•Triangle Solution: Solves plane and spherical triangles.
•Universal Constants: The CODATA physical constants values and descriptions.
•Units Conversion: Physical units conversion, completely customizable.
>General Worksheets:
•Date / Time: Calculates days between dates with Actual, 360 or 365 day calendars, and time intervals between different times.
•Solver: Solves arbitrary equations entered as text for any of the variables, knowing the others.
•Storage Registers: Store and perform operations directly on the calculator's storage registers.
•Memory Content: Clear, back up or restore part or all of the calculator's memory.
•General Settings: Customize display format, decimals, date format, angle unit, left-handed layout, sounds, haptics and more.
•Help Documents: Description and examples of all the calculator worksheets and features.
>Editors: To create or edit data
•(Date,Trx) List: Transactions and their dates for the "Account Balance" worksheet.
•(Date,CF) List: Cash flows and their dates for the "Unequal Periods" worksheet.
•(X,N) List: Values and repetitions for cash flows and statistics.
•(X,Y) List: X and Y data samples for the statistics worksheets.
•Program: Keystroke programs.
•Solver Equation: Algebraic expressions for the "Solver" worksheet.
•Units Database: Customize the "Units Conversion" worksheet.
System requirements: iOS 26.6 or above.
30-day free trial, then a single one-time Lifetime Purchase of $9.99 USD. No subscription.
License Agreement:
http://www.apple.com/legal/itunes/appstore/dev/stdeula
Disclaimer: THIS IS NOT A HEWLETT PACKARD CALCULATOR, AND IS NOT SPONSORED IN ANYWAY BY HEWLETT PACKARD OR ANY OF ITS SUBSIDIARIES.
I first began using RLM’s HP emulators when I purchased my first iPhone; that has to be at least 10 years ago. The app has continuously evolved and been updated for compatibility with larger displays and OS requirements. I’ve tried at least five 12C emulators and have always returned to this app because there is no lag with data entry, calculations are fast, and I’ve yet to find a bug. My questions to the developer have always been responded to quickly and in an enthusiastic manner. I don’t mind paying annual subscriptions for the apps that being me value. It should have been obvious to Apple when App Store was in its infancy that one-time purchases of apps for $0.99 would not create a sustainable business model for developers which explains the sea of abandonware that resulted. This app is a small price to pay to keep it sustainable and compensate the developer for his efforts. I highly recommend it.
Developer Response
Thank you very much for your rating. It encourage us to build top quality and usable calculators for iOS.
Full Access Granted MESSAGE
MTmovie
I keep receiving a message from time to time informing “life time purchase” but with button to click “ok”. If purchase is for life time and paid for why I keep receiving the message on the calculator screen forcing me to click ok? Pls advice. On else, it is a great product— Tks
What happened to the left arrow key?
TedKennedy
This is a Great calculator. I thought that the left arrow key had been replaced by the CLX key, but I found out that there are options to set the behavior of the key. Everything is great again!!
Portrait orientation doesn’t work on iPad
Qwertasdfgqqqqq
Very nice calculator. Only issues I’ve seen are that portrait orientation doesn’t work on my iPad and show registers doesn’t work (shows briefly, then disappears). Issues aren’t deal breakers. Calc worth the money.
Developer Response
In the iPad, the portrait layout is shown only if you have a Split View that reduces significantly the width of the app respect to the height available. The default and preferred layout is landscape as the real world HP-12C.About the Registers, they are shown if the option is set to ON in the Preferences (g PREF) and no menu is shown in the screen side area (toggle with the OPT key).
Version 3.0 is a complete update: a reworked calculator engine, a full-screen program editor, new worksheets (Inventory Turn Over, Return on Investment, Quadratic Equation, Spherical Triangle, Universal Constants and 16 probability distributions), new General Settings, new help documents for every menu, and many accuracy and stability fixes. Subscriptions are gone: after the 30-day free trial, a single one-time purchase unlocks the app for good.
Version 3.0
The developer, R.L.M. Software, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Ricardo Lira Matte
Size
8.1 MB
Category
Finance
Compatibility
Requires iOS 26.0 or later.
iPhone Requires iOS 26.0 or later.
iPad Requires iPadOS 26.0 or later.
Mac Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
