# RPN 12C — HP 12C financial calculator

> HP 12C financial calculator (iPhone/iPad app by Guglielmo Pasa.)

- Source: https://appshunter.io/ios/app/rpn-12c/id6826865969 (this page in markdown: same URL + `.md`)
- Developer: [Guglielmo Pasa](https://appshunter.io/developer/417854438)
- Category: Finance, Utilities
- Price: $9.99
- Age rating: 4+
- Requires: iOS 16.0 · 35 MB
- Languages: American English
- Released: 2026-10-27
- Data updated: 2026-11-01

## What is RPN 12C?

The HP 12C has been the financial calculator of bankers, real-estate agents, accountants and finance students since 1981 — still made today, still allowed in the CFP and CFA exams, still on countless desks. RPN 12C puts one on your iPhone, iPad and Mac, with the face, the keyboard and the display of the real thing.

RPN 12C is a new simulator written from the calculator's owner's handbook, every worked example of the handbook serving as a test: it computes as the 12C does, to its ten digits, with its rounding, its stack and its error messages.

THE CALCULATOR
• RPN with the four-level stack, LAST X, the 20 storage registers and register arithmetic
• Time value of money: n, i, PV, PMT, FV, payments at the beginning or end of the period, odd first periods (simple or compound interest)
• Cash flows: NPV and IRR, up to 20 groups of repeated flows
• Amortization schedules, simple interest (360 and 365 days)
• Bonds: price and yield to maturity
• Depreciation: straight line, sum-of-the-years' digits, declining balance
• Dates: days between two dates (actual and 30/360), a date some days ahead or back with its weekday, day-month-year or month-day-year
• Statistics: mean, standard deviation, weighted mean, linear regression and estimation
• Percentages, powers, logarithms, factorial, rounding, fractional and integer parts
• Programs of up to 99 lines, with GTO, conditional tests, single-step and pause

THE 12C PLATINUM
The app holds a second calculator, the 12c Platinum, written from its user's guide, with its own face and its own memory (menu → Calculator): the same functions, and an ALG mode with up to 13 parentheses, undo, backspace, x², programs of up to 400 lines and cash flows up to CF80.

THE APP
• The calculator's memory stays, as on the 12C (Continuous Memory): close the app, come back later, everything is where you left it
• Turn the calculator over: its back plate, the reference table of keystrokes for dates, interest, amortization, bonds, depreciation and statistics
• Copy the number in X with all its digits, paste numbers from the clipboard
• Decimal point or decimal comma
• Hardware keyboard on iPad, iPhone and Mac; on the Mac, the window takes the calculator's shape and zooms in steady steps
• Works fully offline, no account, no ads, no tracking

The app contains no HP software. HP, HP 12C and HP 12c Platinum are trademarks of HP Inc. This app is an independent project and is not affiliated with or endorsed by HP.

## Is RPN 12C safe?

Not enough ratings yet to assess RPN 12C.

## Is RPN 12C legit?

RPN 12C appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for RPN 12C is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 0.2.0 — 2026-11-01

• The 12c Platinum, a second calculator in the app: menu → Calculator. It adds an ALG mode with parentheses, undo, backspace, x², 400 program lines and 80 cash flows, on its own face and back plate. The 12C and the Platinum each keep their own memory.
• On the 12C: RCL g 12× and RCL g 12÷; storing n, i, PV, PMT or FV no longer stops the stack from lifting; the depreciation amounts and the principal part of AMORT are rounded as on the calculator.
• The faces drawn for the screen are cleaner: no lighter box around the keys.

### 0.1.0 — 2026-10-27

No release notes.

## More apps by Guglielmo Pasa

- [DjVu Reader](https://appshunter.io/ios/app/djvu-reader/id417854435)
- [UniReader: Multi-Format Reader](https://appshunter.io/ios/app/unireader-multi-format-reader/id6759504986)
- [RPN 50g](https://appshunter.io/ios/app/rpn-50g/id6811794850)
- [RPN 48](https://appshunter.io/ios/app/rpn-48/id6814120753)
- [Ma Marge](https://appshunter.io/ios/app/ma-marge/id6814141541)

All apps by Guglielmo Pasa: https://appshunter.io/developer/417854438

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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 2026-11-01.*