12Calc

• Price: $8.99

Last verified 31 Jul 2026

4.9 916 ratings · App Store

1. 5/5Still the best HP12C App Ever After So Many Years! 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.

   Carlos Borromeo · 31 Jul 2026

2. 5/5Best HP 12c app hands down

   I use my physical 12C Platinum a lot, but sometimes it’s not practical to have it with me. For me, this app is superior to the physical device not only because I’m more likely to have it with me, but it can display the tape as well as show the stack. Other HP RPN calculators show the stack and I always found it annoying that the 12C didn’t. One simple addition would turn the tables on my physical device and make this app perfect is to be able to copy the result so I can paste it into my bookkeeping or spreadsheets on my iPad. I’m thinking a tap or click (iPad) on the result should copy the result. It appears there is no way to get the results out of this app outside of remembering them and typing them into other apps manually— lame! Outside of that minor annoyance, this app is full featured, resizable on iPad, snappy (I’ve found others are weirdly laggy) and worth every penny.

   DoTK- · 31 Jul 2026

3. 5/5The best 12C emulator, and I worked for the company that made the physical calculator.

   I’ve had an HP 12C since they first came out. When I bought an iPhone and an iPad, I wanted an emulator that worked at least as well as the physical calculator. My former employer also had a 12C emulator on the App Store, but it was out classed by 12Calc. First off, 12Calc looks great on an iPhone (currently using on a 16 Pro Max) and includes an iPad native full screen app, unlike some other emulators. You can even choose different templates. However, what matters to me is how it works. If you know how to use an HP-12C financial calculator, 12Calc will be immediately familiar. Even if you have never used one, the app provides terrific context-sensitive help. You press the help button, including the “F” and “G” shift functions, and you get an explanation of how to use the calculator. The help feature explains every function in detail and provides useful examples. All the standard 12C functions are there, but there are a bunch of great additions. There are various worksheets for more complicated efforts if you want to track them on the screen. Included are useful conversion tools, so you won’t need a separate conversion app. You can review the memory and even print it out or export to a file. Copy and paste is supported. The developer offers other emulators as well. His TI83/84 graphing calculator emulator (another school/test standard) is impressive. It also provides additional features beyond just the basic calculator emulation. However, if you need the best HP 12C emulator app out there, get 12Calc. There’s even a bundle offered where you can get 12C and additional calculators emulators for discounted price. You won't be disappointed.

   inthesand · 31 Jul 2026

4. 5/5Absolutely the Best Financial Calculator––and Best Developer

   This calculator remains the absolute best Financial Calculator in the market. 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 VERY STRONGLY. 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.

   JGRog · 31 Jul 2026

5. 5/5Very good HP-12c Emulation

   Better than the original HP calculator, by far. It is much faster. I like the ability to save the tape. If you are not familiar with RPN, but you use a calculator app on your phone, you owe it to yourself to take the 5 minutes it takes to learn how to use it. Much easier on your brain and much less likely to make mistakes, once you get used to it. This emulation is easy to read, particularly if you prefer a different color scheme. I would give it 10 stars if it had an option to turn it into a scientific calculator.

   Not fooled today · 31 Jul 2026

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