# Calculator iCalc-Pro - No ads — Familiar operation system

> Familiar operation system (iPhone/iPad app by Takao Ichimura.)

- Source: https://appshunter.io/ios/app/calculator-icalc-pro-no-ads/id6483759413 (this page in markdown: same URL + `.md`)
- Developer: [Takao Ichimura](https://appshunter.io/developer/1474061593)
- Category: Utilities, Productivity
- Price: $3.99
- Age rating: 4+
- Requires: iOS 13.0 · 2 MB
- Languages: American English
- Released: 2024-04-09
- Data updated: 2026-09-07
- User reviews in markdown: https://appshunter.io/ios/app/calculator-icalc-pro-no-ads/id6483759413/reviews.md

## What is Calculator iCalc?

iCalc-Pro is a simple and easy-to-use calculator that uses a familiar operation system without advertisements.
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.
It boots up quickly because there's no splash screen.
Thank you for using iCalc-Pro.

(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

(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.


## Version history (last 5 releases)

### 2.1.0 — 2026-06-30

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

### 2.0.0 — 2026-03-25

Supported numeric formats that use a comma (,) as the decimal separator.
The splash screen was removed to speed up startup.
Made other improvements.

### 1.0.4 — 2025-08-07

Fixed a minor bug and improved performances.

### 1.0.3 — 2025-02-16

Fixed screen layout when using on Mac.

### 1.0.2 — 2024-10-15

Added Icons for Dark and Tinted modes.

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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

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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 2026-09-07.*