# 15C Calculator RPN Scientific

> RPN scientific calculator simulator with programming and advanced functions. (iPhone/iPad app by nguyen ngoc khanh.)

- Source: https://appshunter.io/ios/app/15c-calculator-rpn-scientific/id1247223764 (this page in markdown: same URL + `.md`)
- Developer: [nguyen ngoc khanh](https://appshunter.io/developer/1180909864)
- Category: Education, Utilities
- Price: $2.99
- Rating: 3.50/5 from 4 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 6 MB
- Languages: English
- Released: 2017-06-13
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/15c-calculator-rpn-scientific/id1247223764/reviews.md

## What is 15C Calculator RPN Scientific?

The New 15C is simulator of 15c Scientific Calculator with below functions.

◇Decimal style (1,234,567.89 1.234.567,89)

◇Quick User Guide

◇Contact Support


Features:

* RPN logic with 4 stack levels plus a last X (LSTx) register.

* 67 addressable registers, used for storage registers or program 
steps.

* 19 storage registers in default configuration with 46 registers for programs (appx. 332 program steps).

* Programmable with up to 448 program steps. In this configuration only 3 storage registers are available: R0, R1 and RI

* 10 Flags and 12 conditional tests, such as x = 0, x ≠ 0 and x > y.
Indexed looping via storage gegister I.

* Full storage arithmetic: STO +, −, × and ÷.

* 5 softkeys, labeled A through E.

* Multiple number format: FIXed, SCIentific and ENGineering.

* Trigonometric functions SIN, COS and TAN.

* Hyperbolic trigonometric functions SINH, COSH TANH.

* Three trigonometric modes: DEGrees, RADians and GRADs.

* Reverse trigonometric functions for standard and hyperbolic functions.

* Mean and standard deviation of 2 variables.

* Summation of n, x, x2, y, y2 and xy for statistic calculations of 2 variables.

* Decimal hours and hrs.min.sec. conversions.

* Polar and rectangular conversions.

* Solve and root finder.

* Numeric integration.

* Linear regression.

* Complex numbers.

## Key features

- RPN logic with 4 stack levels
- 67 addressable registers
- Programmable with up to 448 steps
- 10 Flags and 12 conditional tests
- Multiple number formats (FIX, SCI, ENG)
- Trigonometric and hyperbolic functions
- Statistical calculations and conversions

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/15c-calculator-rpn-scientific/id1247223764/reviews.md

### 5/5 — Responsive Developer

*2021-05-28, version 1.2*

The developer has a cool HP 15C and recently responded quickly when I used the contact feature on his HP 16 C, another cool app, to tell him that the HP 15C app was not downloading for my iPhone 11. He fixed things fast. Many thanks.

**Developer response:** Thanks you for your support. We are glad to see new ideas. If you want to join us, don't hesitate to contact us!

### 5/5 — HP calculator fan

*2021-05-28, version 1.2*

The developer has fixed the installation problems. I've started working with the app and I like it.  Just want to say thank you for fixing the installation problem :). I will find out how to delete my unfavorable review so the statistics better reflect my satisfaction with the developers work

**Developer response:** Thanks for your report. We are fixing the issue.

### 1/5 — Won’t download

*2020-12-05, version 1.1*

Purchased this app but it will not download!

**Developer response:** Thanks for your report. We are fixing the issue.

### 3/5 — No portrait mode?

*2019-11-01, version 1.1*

This 15C calculator app doesn’t appear to work in Portrait mode. It only displays in Landscape mode.  I would have asked the developer if I missed a setting for this but he is only on Facebook and I’m not on Facebook.

**Developer response:** Thanks for your report. We are fixing the issue.

## Frequently asked questions about 15C Calculator RPN Scientific

### What is the 15C Calculator RPN Scientific app?

The 15C Calculator RPN Scientific app is a simulator of the 15c Scientific Calculator. It features RPN logic, extensive storage registers, and advanced programming capabilities for complex calculations.

### What are the key features of 15C Calculator RPN Scientific?

Key features include RPN logic with 4 stack levels, 67 addressable registers, programmability up to 448 steps, trigonometric and hyperbolic functions, and multiple number formats.

### Is 15C Calculator RPN Scientific suitable for educational purposes?

Yes, it is categorized under Education and provides advanced mathematical functions, statistical calculations, and programming features beneficial for students and educators.

### What devices does 15C Calculator RPN Scientific support?

The app is supported on iPhone and iPod devices, as indicated by the provided data.

### How much does 15C Calculator RPN Scientific cost?

The app is a paid application and is priced at $2.99.

### Does 15C Calculator RPN Scientific have ads?

No, the application does not contain advertisements, as indicated by the 'hasAds' flag being false.

### When was 15C Calculator RPN Scientific last updated?

The app was last updated on May 26, 2021, with version 1.2.

### What is the age rating for 15C Calculator RPN Scientific?

The app has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 3 releases)

### 1.2 — 2021-05-26

Hello All,
Sorry to keep you all waiting for the "Keyboard sound on/off" feature.
This update includes
- iOS 14 compatibility
- Added keyboard sound on/off
- Updated the new app icon
- Fixed the color background
- Fixed bundle display name

### 1.1 — 2017-08-04

This app has been updated by Apple to display the Apple Watch app icon.

Fix bugs

### 1.0 — 2017-06-13

No release notes.

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All apps by nguyen ngoc khanh: https://appshunter.io/developer/1180909864

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*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.*