12Calc3.0 - App Store

12Calc is a full version of the well known HP12C for the iPhone and iPad. It also includes an audit tape, unit converter, worksheets, rotated views, user guide and HD graphics optimized for iPad and iPhone retina displays.

.Runs in 64 bit mode on the latest iOS release and new iPads and iPhones.

.Calculations are highly accurate and blazing fast. No more "running" flashing displays for amortizations, depreciation schedules or interest calculations. Work as fast as you can type.

.Audit Tape: The audit tape keeps a record of your calculations. You can review, mail, text, share or print the tape.

.Unit Converter: Convert between a wide variety of common units and currencies. Currency rates can be downloaded from the internet.

.Work Sheets with interactive graphs:
Auto Purchase
Black-Scholes
Bond
Break-even
Cash Flow analysis
Currency
Date
Depreciation
Interest Conversion
Lease
Loan Amortization (includes option for Canadian mortgages)
Margin&Markup
Refinance
Statistics
Tip
TVM

.Views for all orientations: Portrait and landscape renderings of the full keyboard are provided for iPhone and iPad. The iPad version includes slide over and multiple split view displays as well as side-by-side display of the help page, audit tape, tvm mortgage table or program variables.

.Built-in contextual help: Touch the ? key for a description of any keyboard function with examples of use. If you are just learning or can't remember how to use a function- just touch the ? key. Includes tutorials on how to use reverse Polish notation (RPN) and how to solve time value of money problems.

.HD Graphics: Graphics optimized for both retina and standard resolution screens. Choose from multiple color schemes including gold, rose gold, brass, copper, silver and several color tints.

Version History •Fixed currency download
•Fixed register save / restore 3.0 09/01/2025 • Fixed currency worksheet dark mode
• Updated for iOS changes 2.9 08/14/2025 •Update for iOS17
•Added iPhone orientation lock to settings
•Fixed keyboard subtract 2.8 12/09/2023 • Update for iOS15 changes
• Fixed iPad f&g display
• Adjusted darkmode colors 2.7 12/30/2021 • Update for iOS15.2
• Improved readability of stack display
• Fixed converter view dark mode 2.6 12/15/2021 • Updates for iOS15
• Added dark mode
• Added iPad keyboard support 2.5 12/08/2021 • Updated for (more) changes/bugs introduced by iOS12.3
• Improved currency converter (again)
• Fixed worksheet file save 2.4 04/03/2019 • Update to workaround iOS12.3 display bug
• Fixed program file view
• Improved currency exchange converter 2.3 03/30/2019 • Update to work around iOS11.0.1 bugs. Apple is changing the view system without working out all the details. Important pieces such as setRightBarItems have just stopped working as a result of introducing a big black notch smack in the middle of the top of the screen. How is this a good idea? My users certainly have let me know they don't appreciate updating iOS and then their apps no longer work.
• To my users- I'm trying to stay on top of this and will continue to update the app to work around Apple's latest "design innovations" :-(
• Restored waste basket and action buttons on audit tape for iPhone
• Added taptic feedback on key touches (requires iPhone with taptic engine) 2.2 10/02/2017 •Update for iOS11
•drag and drop calculations from the audit tape
•Added saving iPad orientation & side panel settings
•Fixed currency worksheet
•Fixed contact developer mail 2.1 09/25/2017 • Update for iOS changes
• Added full function vertical keyboard
• Added iPad slide over and split views
• Added Settings View
• Added ? key help system
• Added Help function
• Added direct keyboard access to worksheets
• HTTPS security update
• Added audit tape and rotate buttons for iPad
• Added hide / show of tape on iPad
• Updated graphics for iPad Pro and large display iPhones 2.0 05/08/2017 1.0 12/19/2013