# 16C Scientific RPN Calculator — Programmer's calculator > A scientific RPN calculator simulating the HP 16C for programmers. (iPhone/iPad app by nguyen ngoc khanh.) - Source: https://appshunter.io/ios/app/16c-scientific-rpn-calculator/id1247206380 (this page in markdown: same URL + `.md`) - Developer: [nguyen ngoc khanh](https://appshunter.io/developer/1180909864) - Category: Education, Utilities - Price: $1.99 - Rating: 3.42/5 from 12 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 10 MB - Languages: English - Released: 2017-06-12 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/16c-scientific-rpn-calculator/id1247206380/reviews.md ## What is 16C Scientific RPN Calculator? This App is a full simulation of the successful 16C Scientific RPN calculator. ◇The 16C could display numbers in Hexadecimal, Decimal, Octal and Binary formats using a standard 7 segment display ◇Decimal style (1,234.5 1.234,5) ◇Support Contact ◇16C Functions The 16C provided a wealth of functions for the programmer including. Integer and floating point math. Shift functions: Left and right, arithmetic and non. Rotate functions: Rotate a single position or N positions left or right, through carry or not. Left justify the bits of a word. Masking: Create masks to mask left or right N bits. #B: returned number of bits set in a word Multiply/Divide: Provided functions for multiplying single precision numbers into single precision or double precision results. Likewise, allowed single or double precision dividends. Bitwise Logic: and, or, not, xor Bit setting and testing Flag setting and testing: (user flags and overflow/carry) ## Key features - Hex, Dec, Oct, Bin display - Integer and floating point math - Bitwise logic operations - Shift and rotate functions - Masking capabilities - Bit setting and testing ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/16c-scientific-rpn-calculator/id1247206380/reviews.md ### 4/5 — Great HP16C emulator *2021-05-14* This is a great HP16C emulator — I use it all the time — the only suggestion would be to make the chars easier to see and maybe to have an original HP calculator skin — it would be 5 stars if the kbd chars were easier to see — but it is a great calculator :) ### 2/5 — Hard to read *2021-03-25, version 1.0* Can’t read the yellow labels. Really ruins an otherwise good app. Five stars if they fix it. ### 1/5 — Not s real 16c *2020-10-23, version 1.0* Hex magnitudes are limited to FFFF. I bought it to escape that limitation in another calculator and was disappointed. I'll delete it. Should have read the reviews. I made the mistake of trying it again on my new ‘phone. There is no way to close it on my XR. There is no drag- up bar, and the app will not rotate out of landscape orientation. **Developer response:** Thank you for your review. ### 5/5 — Works a charm! *2020-04-20* Runs my old (not very mind taxing) HP16C programs fine. Function labels could be darker. 0x0c should be 'C', not 'c'. ### 5/5 — Great HP 16C Emulator! *2020-03-04* This runs great! Programs even run also! I’ve never used a real 16C but I have the manual and can really get a feel for how it worked. Great for learning and the programs even useful - I wrote a percentage increase program and also typed in the factorial example up on Wikipedia! ### 3/5 — Accurate but needs UX love... *2019-08-08, version 1.0* UPDATE 190808: Dev said they'd fix readability but no change _many_ months later, support seems lacking. shame too, had potential. --- It's a surprisingly accurate 16c emulation (though I've found a few minor issues). Alas, color of keypad "shiny" background towards center makes yellow labels almost unreadable. needs a darker background with more contrast. Also not sure email sent to support regarding bugs is getting through, no replies received. In general decent solid emulator -- with some UX tweaks and a few bug fixes it would earn 5 stars! ### 4/5 — Good but poor readability *2019-05-05, version 1.0* I loved my HP 16 C. (I wonder whatever happened to it.) This app is an inexpensive emulator that does a good job. My biggest complaint is poor readability of the yellow function labels, especially in the central area. Please get rid of the background color gradient! ### 5/5 — Not the 16c! (Fixed) *2019-03-10, version 1.0* The developer has fixed this issue and everything seems to be working. Original Review: I bought this for the programmer’s tools like hex to decimal, binary conversions, etc. This app does not not have any of this. Instead, it the HP11c engineering calculator. I have both the real HP16c and HP11C, so I’m sure. What a bummer! IT IS NOT WHAT IS ADVERTISED!!! **Developer response:** Thank you for your review. We’ll fix this problem. ### 5/5 — It will do more than 16 bits *2019-02-28, version 1.0* Been looking for a 16c since the old app I have was never updated to iOS 11. Looks like it works in two minutes playing with it (and I do have a real 16C at home). To respond to an earlier review... it will do more than 64 bits. Go to decimal mode, enter 32 and then do f wsize. That sets the word size. It will even do 64 bits, you have to scroll the display with g arrows (on the STO RCL buttons). Not convenient but it works and matches what I recall of the 16c (I have not used that particular function in years). The dots on either side of the h (or b, d, o) indicate that scrolling is needed. Thanks for the app, now I can finally upgrade from iOS 10... ### 2/5 — has an AND problem *2017-07-09, version 1.0* everything went fine until I tried to AND 0x72 with 0x3f Th eresult was 33 not 32 tried using binary and got the same results. **Developer response:** Thank you for your review. We will fix this problem. ## Frequently asked questions about 16C Scientific RPN Calculator ### What number formats does 16C Scientific RPN Calculator support? 16C Scientific RPN Calculator supports displaying numbers in Hexadecimal, Decimal, Octal, and Binary formats, mimicking the capabilities of the original 16C calculator. ### What kind of math functions are available in 16C Scientific RPN Calculator? The calculator offers a wide range of functions for programmers, including integer and floating-point math, multiply/divide operations for single and double precision numbers, and bitwise logic operations like AND, OR, NOT, and XOR. ### Does 16C Scientific RPN Calculator have ads? No, 16C Scientific RPN Calculator does not contain advertisements. It is a paid application designed to provide an uninterrupted user experience. ### What devices is 16C Scientific RPN Calculator compatible with? 16C Scientific RPN Calculator is supported on iPhone and iPod devices. It is designed for iOS operating systems. ### How often is 16C Scientific RPN Calculator updated? The application was last updated on June 12, 2017, with version 1.0. There have been no subsequent updates listed. ### What is the age rating for 16C Scientific RPN Calculator? 16C Scientific RPN Calculator has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in learning about number systems and programming concepts. ### What is the price of 16C Scientific RPN Calculator? 16C Scientific RPN Calculator is available for a one-time purchase price of $1.99. ### Does 16C Scientific RPN Calculator offer any in-app purchases? No, 16C Scientific RPN Calculator does not feature any in-app purchases. The single purchase price unlocks all functionalities of the application. ## Version history (last 1 release) ### 1.0 — 2017-06-12 This app has been updated by Apple to display the Apple Watch app icon. ## Apps similar to 16C Scientific RPN Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [RPN Memory Calculator](https://appshunter.io/ios/app/rpn-memory-calculator/id1398878075) | — | Free | Education | | [Bayes' Theorem Calculator](https://appshunter.io/ios/app/bayes-theorem-calculator/id1501762787) | 3.0 (1) | $0.99 | Education | | [Hareni](https://appshunter.io/ios/app/hareni/id1540573616) | — | Free | Education | | [AWS DVA-C01 Certification](https://appshunter.io/ios/app/aws-dva-c01-certification/id1575142113) | — | Free | Education | | [Learn Haskell Offline Pro](https://appshunter.io/ios/app/learn-haskell-offline-pro/id1634772955) | — | $0.99 | Education | | [SlipStick](https://appshunter.io/ios/app/slipstick/id1523544516) | 5.0 (9) | $0.99 | Education | ## More apps by nguyen ngoc khanh - [VPN Quick Connect - Today Widget support](https://appshunter.io/ios/app/vpn-quick-connect-today-widget-support/id1215189588) - [Light HD Wallpaper](https://appshunter.io/ios/app/light-hd-wallpaper/id1220338804) - [Classic Solitaire - Cards Game](https://appshunter.io/ios/app/classic-solitaire-cards-game/id1227379519) - [8192- Puzzle Game](https://appshunter.io/ios/app/8192-puzzle-game/id1229395428) - [12C Calculator Financial RPN - Cash Flow Analysis](https://appshunter.io/ios/app/12c-calculator-financial-rpn-cash-flow-analysis/id1235576026) - [11C Scientific Calculator RPN](https://appshunter.io/ios/app/11c-scientific-calculator-rpn/id1247100501) All apps by nguyen ngoc khanh: https://appshunter.io/developer/1180909864 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*