# RHW Calc

> RHW Calc (iPhone/iPad app by Takashi Sakurai.)

- Source: https://appshunter.io/ios/app/rhw-calc/id673840448 (this page in markdown: same URL + `.md`)
- Developer: [Takashi Sakurai](https://appshunter.io/developer/673840871)
- Category: Productivity, Utilities
- Price: $0.99
- Age rating: 4+
- Requires: iOS 8.1 · 2 MB
- Languages: enc, Japanese
- Released: 2013-07-24
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/rhw-calc/id673840448/reviews.md

## What is RHW Calc?

This computer calculates the chord length of a circle, arrow quantity, a radius, an angle, etc. using trigonometric functions. 
It corresponds also to chord length calculation of a special circle with a straight line. 
- In RH computer mode, chord length (W) and a radius (R) to calculation or arrow quantity (H) is [ a radius (R) ] computable from chord length (W) and arrow quantity (H). 
- In W computer mode, calculation, or arc length (L) to a radius (R) and chord length (W) is [ chord length (W) ] computable from a radius (R) and an angle (theta). 
Furthermore, in this mode, it can be chosen as the both ends or one side of a circle from the figure of eight patterns to which the straight line was attached, and can ask for chord length (W). 
* Thickness is given to a circle and a straight line and the chord length (W) of an inner R side and each outside R side is called for. 
(It contains in eight patterns)


## Version history (last 5 releases)

### 1.0.5 — 2015-02-27

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

Started by shortening display time of start-up screen is now faster.

### 1.0.4 — 2014-01-07

Identifies the 640 × 1136 (iPhone5 later) and screen size 640 × 960 (iPhone5 earlier), in the case of 640 × 1136, was to restrict the movement of the text box when you keyboard display.

### 1.0.3 — 2013-09-26

It corresponded to iOS7.

### 1.0.2 — 2013-08-15

Operation has been improved. 
- When a keyboard was displayed, the improvement of operation which a figure scrolls and hides was made. 
-The arrow display urged to the image scroll in W computer mode was improved. 
-calculation conditions and a calculation result are divided and the calculation result display method in W computer mode is displayed -- as --   It has improved.

### 1.0.1 — 2013-08-01

Improvement in operativity and fault correction were made. 
Operativity and other improvements: 
-The scroll picture of W computers was changed. 
-A part of calculation result notation of W computers has been improved. 
- a calculation button can be pushed even if it does not store a keyboard after a numerical input -- as --   Button arrangement was changed. 
Fault correction: 
- When it turned sideways, the display layout had collapsed, but it fixed only to the vertical display.

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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 2026-05-19.*