# Desktop Calculator C - Excellent & Convenient

> A free, feature-rich calculator for home and office with advanced functions. (iPhone/iPad app by Takahiro Kusano.)

- Source: https://appshunter.io/ios/app/desktop-calculator-c-excellent-and-convenient/id1118457662 (this page in markdown: same URL + `.md`)
- Developer: [Takahiro Kusano](https://appshunter.io/developer/1114414985)
- Category: Productivity, Utilities
- Price: Free
- Rating: 2.30/5 from 3 App Store ratings · 41 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 28 MB
- Languages: American English, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China) and 3 more
- Released: 2016-06-03
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/desktop-calculator-c-excellent-and-convenient/id1118457662/reviews.md

## What is Desktop Calculator C?

This free calculator app is ideal for the home or office.

Features:
Independent Memory, Square Root, Change Sign (+/-), Tax Calculation, Percent Calculation, Constant Calculation, Grand Total, Slide Switch(Rounding), Calculation result history

- TAX calculation
(1) How much is Price-plus-Tax of 1000?  
Input 1000 [TAX+].
(2) How much is the Price-less-Tax of 1080?  
Input 1080 [TAX-].
* You can check Tax rate by pressing [TAX+]

- Slide Switch(Rounding)
F: Floating Decimal
CUT: Values are cut off to the number of decimal places specified by the current Decimal Place Selector setting
UP: Values are rounded up to the number of decimal places specified by the current Decimal Place Selector setting
5/4: Values are rounded off (0,1,2,3,4 are cut off; 5,6,7,8,9 are rounded up) to the number of decimal places specified by the current Decimal Place Selector setting
4,3,2,1,0: Specifies the number of decimal places as 4,3,2,1,0

- Percent Calculation
Adding 10%: 1000 [×] 10 [%] [+]
Subtract 10%: 1000 [×] 10 [%] [-]

1000+10%: This is a markup on price procedure. The formula is as follows:
Markup%=(Markup Price-Cost)/(Markup Price)

- Grand Total
Whenever the “=” Key has been pressed, the result will be stored into the Grand Total Memory. The “GT” Key is to recall the Grand Total Memory. It’s function is similar to the “MR” Key, both of them are used for recalling the Memory Content.

- Constant Calculation
Press "+", "-", "×", "÷" twice to register a constant. The "K" indicator is displayed to indicate that Constant Calculation is in effect. This will reverse the order of the input values, for example, if you input 4--3, the result of the constant calculation will be 3-4.

* There is some paid content

## Key features

- Independent Memory
- Tax Calculation
- Percent Calculation
- Grand Total Memory
- Multiple Rounding Options
- Calculation History

## Recent user reviews (10 of 41)

All indexed reviews: https://appshunter.io/ios/app/desktop-calculator-c-excellent-and-convenient/id1118457662/reviews.md

### 3/5 — もっと欲しい

*2025-09-06, version 1.3.5*

カシオ電卓持ってるからいいが、日数計算の機能も欲しいです。じゃないとビジネス計算ができないです。

### 4/5 — CASIO派にはいい

*2025-03-20, version 1.3.5*

シンプルでいいんですが広告が消せません。広告削除の部分が無効のままです。課金してでも消したいので改善お願いします。

### 1/5 — why?

*2022-08-16, version 1.3.5*

このアプリで普通計算できなくね？

### 1/5 — In App ads

*2021-12-06, version 1.3.5*

In app ads

### 4/5 — メモリーの保護が欲しい

*2021-12-01, version 1.3.5*

デザインや使い勝手はいいのですが、メモリー保存したデータが本体再起動しても残っていて欲しいです。

### 4/5 — カシオ派の人におすすめ

*2021-04-19, version 1.3.5*

普段電卓でCASIOを使っている人には違和感のない電卓アプリ。

iPhone標準の電卓アプリでは
2+2×2=6  となってしまうが

この電卓アプリだと
普通の電卓のように、順番通りに計算されて8になる。

普通の電卓の感覚で、iPhone標準の電卓を出先で使うと、小計後に税を掛けるような時に注意しなければ間違ってしまうので、このアプリを使ってます。

### 1/5 — 立ち上がらない。

*2020-12-15, version 1.3.5*

機能的には満足して使ってきましたが、最近立ち上がらないようになりました。

### 5/5 — でんたーく

*2020-12-06, version 1.3.5*

電卓を学校に忘れた時に使いました。iPhoneに入ってるやつよりこっちの方が使いやすい！！忘れた時また使います‪w

### 2/5 — こんな醜いやり方は！！

*2020-11-27, version 1.3.5*

以前有料版を購入したのに最近は起動後何度もappstoreに飛んでしまいます。
これでは使い物になりません。

### 1/5 — 有料版にしたのに

*2020-11-19, version 1.3.5*

使用していた　Realcalc C がios14から使えなくなったので乗換えました。
広告非表示のために有料版を購入したのに、電卓画面のままにしておくとAppstoreのダウンロード画面に勝手に遷移します。広告ではありませんが酷いと思います。
金返せ‼︎

## Frequently asked questions about Desktop Calculator C

### What does this calculator app do?

This app is a free calculator designed for home and office use. It provides advanced functions beyond basic arithmetic, including tax calculations, percentage operations, and memory functions.

### What are the key features of this calculator?

Key features include independent memory, square root, change sign, tax calculation, percentage calculation, constant calculation, grand total memory, and various rounding options like floating decimal, cut off, round up, and 5/4 rounding.

### Is this calculator app free to use?

The app is free to download and use for its core functionalities. However, it does mention some paid content, indicating that certain advanced features or customizations may require a purchase.

### How do I perform a tax calculation?

To calculate price-plus-tax, input the price followed by [TAX+]. To calculate price-less-tax, input the price followed by [TAX-]. You can also check the current tax rate by pressing [TAX+].

### What are the different rounding options available?

The app offers several rounding methods: F (Floating Decimal), CUT (values are cut off), UP (values are rounded up), 5/4 (standard rounding), and specific decimal place settings (4, 3, 2, 1, 0).

## Version history (last 5 releases)

### 1.3.5 — 2017-06-07

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

- Library updated
- Miner Bug Fixes

### 1.3.4 — 2017-04-24

- Fixed bug in percent calculation

### 1.3.3 — 2017-04-20

- Library updated

### 1.3.2 — 2017-02-13

- Miner Bug Fixes

### 1.3.1 — 2017-01-17

- Miner Bug Fixes

## Apps similar to Desktop Calculator C

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [WhiteBoard-More freedom](https://appshunter.io/ios/app/whiteboard-more-freedom/id836987207) | 4.5 (2) | Free | Productivity |
| [Notebook calculator (ge-calc)](https://appshunter.io/ios/app/notebook-calculator-ge-calc/id388632863) | 4.9 (49) | Free | Productivity |
| [BLNOTE](https://appshunter.io/ios/app/blnote/id386240418) | 3.8 (6) | Free | Productivity |
| [Calculator 2tax](https://appshunter.io/ios/app/calculator-2tax/id1476140837) | 5.0 (1) | Free | Productivity |
| [Photo Calc - Simple Calculator](https://appshunter.io/ios/app/photo-calc-simple-calculator/id1130778812) | 3.5 (8) | Free | Productivity |
| [おとなのカレンダー - すぐに使えるシンプルなスケジュール帳](https://appshunter.io/ios/app/id987143083) | 4.1 (10) | Free | Productivity |

## More apps by Takahiro Kusano

- [Date & Time Calculator - Quick and Simple](https://appshunter.io/ios/app/date-and-time-calculator-quick-and-simple/id1114414986)
- [Dual Display Calculator - Simple and Easy-to-use](https://appshunter.io/ios/app/dual-display-calculator-simple-and-easy-to-use/id1120989361)

All apps by Takahiro Kusano: https://appshunter.io/developer/1114414985

---

*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.*