# Simple Calculator - iCalc — Familiar operation system

> Simple, familiar calculator with history, formula display, and clipboard. (iPhone/iPad app by Takao Ichimura.)

- Source: https://appshunter.io/ios/app/simple-calculator-icalc/id1596290232 (this page in markdown: same URL + `.md`)
- Developer: [Takao Ichimura](https://appshunter.io/developer/1474061593)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.86/5 from 28 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 15 MB
- Languages: English, Japanese
- Released: 2021-11-25
- Data updated: 2026-07-06
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/simple-calculator-icalc/id1596290232/reviews.md

## What is Simple Calculator?

iCalc is a simple and easy-to-use calculator that uses a familiar operation system.
It can be calculated by the same operation as real calculators. (Compliant with calculator of company C)
It also has functions unique to the calculator app, such as displaying calculation history and calculation formulas.
There is ⓘ button to display the information page that describes instructions.
Thank you for using iCalc.

(Instructions)
The operation for Arithmetic Calculations, Root Calculations, Constant Calculation and Independent Memory Calculation are the same as real general calculators. (Compliant with calculator of company C)

The original operations and functions are as follows.
- After calculation with the [=] key, the result is displayed on the main display and a white frame is added.
- If you tap an operator key instead of [=] key to calculate, the operator turns white, indicating that you are preparing for the next calculation.
- The calculation formula is displayed below the main display.
- Flipping the main display while inputting, the minimum digit of the displayed input value will be erased one by one.
- Flipping the MR display for independent memory to erase the value in independent memory.
- Call the calculation history with [▼older] key. Repeat tapping to call older history. If you called a calculation history that was too old, you can use [▲newer] key to return to newer history. 
- Tapping [C] key to erase the entered value. And [C] key changes to [AC] key.
- Tapping [MR] key to enter the value of the independent memory. And [MR] key changes to [MC] key.
- [copy] and [paste] keys for clipboard.
- Percent Calculations
    What is 25% of 100?
      [1] [00] [×] [2] [5] [%] → 50
    25% of what number is 100?
      [1] [00] [÷] [2] [5] [%] → 400
    What is 100 increased by 25%?
　  [1] [00] [+] [2] [5] [%] → 125
    What is 100 decreased by 25%?
　  [1] [00] [−] [2] [5] [%] → 75
- Can be used in environments where either a period or a comma is used as the decimal separator.

(Others)
- The calculation range is −999,999,999,999 ~ 999,999,999,999.
- The maximum number of digits is 12.
- The developer assumes no responsibility for any loss or claims by third parties which may arise from the use of this app.

## Key features

- Familiar operation system
- Calculation history
- Calculation formula display
- Copy and paste functionality
- Percentage calculations
- Supports period or comma decimal separators

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/simple-calculator-icalc/id1596290232/reviews.md

### 5/5 — 使いやすい

*2025-08-21, version 1.4.14*

シンプルで使いやすいです

### 3/5 — 改良希望

*2025-01-06, version 1.4.12*

iPhoneのサイズがデカくなるに従い、操作感が悪くなる。要は片手で操作し易くボタン配置を変更出来ると良い。

### 2/5 — Icalc

*2024-02-08*

Would be better without the ads. Having to wait for the app to open compared to other calculators I have downloaded. Need rid of the ads but not paying £4.99! Don’t mind paying £1.99 or a bit more. Other calculators I have used open instantly. Don’t have to wait a few seconds like this one. Please can you update this? And there’s no vibrate on this either like haptic feedback.

**Developer response:** I have released a paid version of "iCalc-Pro" without advertisements. Thank you for your advise.

### 1/5 — Runs slowly.

*2024-01-30, version 1.4.2*

It takes a few seconds to display the logo that doesn't matter every time.

### 1/5 — cm

*2023-11-23, version 1.3.5*

いちいちcmが出てそれを消してからでなければ使えないのでとつも使いづらい。毎回でるcmは全く見ないので私にとっては無意味！他に計算アプリが有れば即変更したい。

### 1/5 — 広告が

*2023-10-27, version 1.3.4*

広告が

### 1/5 — 広告が邪魔

*2023-09-13, version 1.3.1*

計算したい時に広告が邪魔

### 1/5 — 機能に関しては何もいうことありません。

*2022-07-09, version 1.1.1*

広告が煩わしいです。

## Frequently asked questions about Simple Calculator

### Does iCalc have ads?

Yes, iCalc contains advertisements. As a free utility app, it is supported by ads to provide its functionality to users.

### What is the update frequency for iCalc?

The latest version of iCalc was released on March 14, 2026. Previous updates indicate a release date of November 25, 2021, suggesting infrequent but significant updates.

### What devices is iCalc compatible with?

iCalc is compatible with iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users.

### What is the age rating for iCalc?

iCalc has an age rating of 4+, indicating it is suitable for young children and general audiences.

### How does iCalc handle calculation history?

iCalc allows users to call calculation history using the [▼older] key and navigate back to newer history with the [▲newer] key. This feature helps users review past calculations easily.

### Can iCalc perform percentage calculations?

Yes, iCalc supports various percentage calculations, including finding a percentage of a number, determining what number a percentage represents, and increasing or decreasing a number by a percentage.

### What is the calculation range for iCalc?

The calculation range for iCalc is from -999,999,999,999 to 999,999,999,999, with a maximum of 12 digits per number.

### How does iCalc compare to other calculator apps?

iCalc is designed with a familiar operation system, similar to real calculators, and offers unique functions like displaying calculation history and formulas, which may differentiate it from simpler calculator apps.

## Version history (last 5 releases)

### 2.2.0 — 2026-06-19

- Added a shortcut for copy & paste in keyboard-based environments.
- Made minor improvements and enhanced performance.

### 2.1.0 — 2026-04-10

Made minor improvements and enhanced performance.

### 2.0.1 — 2026-03-14

Made minor improvements and enhanced performance.

### 2.0.0 — 2026-02-21

Supported numeric formats that use a comma (,) as the decimal separator.
Other improvements.

### 1.4.16 — 2025-10-12

Fixed a minor bug and improved performances.

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## More apps by Takao Ichimura

- [Smart Calculator - SmartCalc](https://appshunter.io/ios/app/smart-calculator-smartcalc/id1474061594)
- [Japan Consumption Tax Calc](https://appshunter.io/ios/app/japan-consumption-tax-calc/id1475187358)
- [India Calculator - IndiaCalc](https://appshunter.io/ios/app/india-calculator-indiacalc/id1476661552)
- [Arabic Calculator - ArabiCalc](https://appshunter.io/ios/app/arabic-calculator-arabicalc/id1477192394)
- [Modulo Calculator](https://appshunter.io/ios/app/modulo-calculator/id1514351751)
- [Sheet Count Calculator](https://appshunter.io/ios/app/sheet-count-calculator/id1516419390)

All apps by Takao Ichimura: https://appshunter.io/developer/1474061593

## Related topics

[icalc](https://appshunter.io/ios/topics/icalc)

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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 2026-07-06.*