RPN Calc
James Mattis
Getting the latest details from the App Store…
James Mattis
Getting the latest details from the App Store…
A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch! If you are familiar with HP RPN calculators, the operation of this calculator should seem very straightforward - albeit simplified. It can't be programmed, and it doesn't handle binary, or hexadecimal numbers. But, it has a clean, simple interface with large, easy to press buttons. It has all of the functions required for quick calculations when your iPhone is handier…
Top of Paid · Utilities in Japan. RPN Calc is #56 there. Changes are over 7 days.
How the app presents itself on the App Store. Select a screenshot to open it full size.
Version 13.1.0 · 13 Aug 2026 · 1 month ago
- An updated Watch interface with a new math function screen accessed by up / down swipes or by using the Digital Crown.
Every chart this app is in right now, best position first.
| Chart | Rank | 24 h | 7 days | Best | Days on chart |
|---|---|---|---|---|---|
Higher on the chart is better: #1 is at the top.
| #56 |
| New entry |
| Change unknown |
| #56 |
| 1 |
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Japan · Paid · Utilities: best #56, latest #56, over 6 snapshots since 8 Oct. No snapshots from 8 Oct to 9 Oct, on 9 Oct, and on 10 Oct; the line joins the snapshots on either side.
Entries, big moves, #1s and new versions we've recorded.
