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
Cash Flow analysis
Interest Conversion
Loan Amortization (includes option for Canadian mortgages)

•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.

What’s New

Version 2.7

• Update for iOS15 changes
• Fixed iPad f&g display
• Adjusted darkmode colors

Ratings and Reviews

4.9 out of 5
400 Ratings

400 Ratings

JGRog ,

Absolutely the Best Financial Calculator––and Best Developer

In an earlier review I gave this phenomenal app 5 stars but wanted to give it 100. Now, I want to give it 1,000. Without any doubt, this is the #1 calculator of its kind on the market in this CPA's opinion. I use this every day for a wide variety of professional and personal reasons. In addition to doing all the HP 12-C calculations, it has templates for leases, loans, time value of money, multi-year financial ratios, foreign exchange calculations, etc. I use the conversions feature to help me with calculations necessary when I fly general aviation aircraft. One of the best, most useful features is an electronic "tape," which, amazingly, can be e-mailed as a PDF file for printing if need be. This makes the app substantially more valuable than any physical calculator or any comparable app.

When I bought this app for my iPhone, I expected to have to pay again for my iPad, but, no, I could download it onto my iPad for no additional cost. This calculator is outstanding. The developer, Ernie Brock, is a genius. He keeps making his app better and better all while staying ahead of Apple’s iOS changes that impact the functionality of the program.

I recommend this fantastic app HIGHLY. It continues to get me through CPA seasons, and it makes calculations of pilotage and dead reckoning much easier when I plan cross country flights.

Carlos Borromeo ,

Still the best HP12C App Ever! Even more so now with this latest update!

The updates on this app keep it at the top of my list of most used apps on my iPhone and other Apple devices. I have always owned at least three HP 12C handheld calculators since these came to the market decades ago. I still do today but now that I am on my iPhones and iPads most of every waking hour I find it so convenient to be able to click on Ernest Brock's 12Calc on my iPhones and iPads while working numbers on these devices. I have been a user of Ernest Brock's 12Calc from its first appearance and through its periodic updates with new features as Mr. Brock has again done with this superb 12Calc Version 2.3! I am now 76 years old and since these came out in the market I have used and recommended to family and friends both the HP12C handheld calculator and Ernest Brock's 12Calc app. I will continue to use and recommend these to anyone looking for timeless products that are classics in their industry. Good job, HP and Ernest Brock! Your excellent products enhance each other like supportive partners, which is how I view and use your products.

mctrader123 ,

Greatest Calculator

Ernest Brock has done a phenomenal job with this App.
I first downloaded a version of this years ago when it was offered free for a short time. Then (I believe) HP asked Ernie to make some changes.
I was extremely worried when I updated my first iPhone, because I thought I would lose this App. But it kept on working. Finally with my iPhone 7, I finally broke down to repurchase the newer (and improved) version.

If you are a fan of HP-12C calculator, then you will likely find this App very intuitive, and I won’t go into describing all the ways it can be used.

But some of the novel features include:
* Currency converter, and current currency values can be updated whenever you want.
*. A “tape” feature, so that you can see what an adding machine tape would show if it were part of the HP-12C calculator.

And although I don’t use it for much more than a basic calculator with financial and real estate (loan, mortgage, PV, etc) calculations as I did for years with my regular HP-12C, I can honestly say that I use this App ALL THE TIME, especially during tax season!

Finally, over the years I have had 2-3 emails with Mr Brock, who has always been prompt, honest, and provided me with valuable tips and help. Just what you want with a developer.

So, stop reading, and go buy the App! You will find it very worthwhile1

2020 is here and my earlier review still stands. Great App. Great support. Go get it!

App Privacy

The developer, Ernest Brock, 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


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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