# CMCalc — Computer Math Calculator

> Emulates 1980s Casio CM-100 computer math calculator with modern features. (iPhone/iPad app by William David.)

- Source: https://appshunter.io/ios/app/cmcalc/id974432836 (this page in markdown: same URL + `.md`)
- Developer: [William David](https://appshunter.io/developer/974432835)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.50/5 from 6 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 4 MB
- Languages: English
- Released: 2015-03-12
- Data updated: 2026-09-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cmcalc/id974432836/reviews.md

## What is CMCalc?

The CMCalc application is a replica of the Casio CM-100 Computer Math Calc solar powered calculator that was sold in the mid 1980’s. It performs simple decimal arithmetic and basic binary conversions (decimal - binary - octal - hexadecimal) and binary logic functions. While it is a standard infix calculator, it supports operator grouping with parentheses. For hexadecimal calculations, the input keys include A through F.

CMCalc application performs all the same functions as the calculator, and has the same look as the original. There are a couple features that were not conceivable in the 1980’s on a calculator … such as the ability to copy and paste the results or the entered function, and a landscape mode for devices with 4 inch or larger screens. The face of the calculator can be viewed in two modes including a traditional application style, and a photo replica of the original calculator face.

## Key features

- Decimal arithmetic
- Binary conversions (decimal, binary, octal, hexadecimal)
- Binary logic functions
- Operator grouping with parentheses
- Hexadecimal input (A-F)
- Copy and paste results/functions
- Landscape mode

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/cmcalc/id974432836/reviews.md

### 5/5 — Amazing Calculator

*2023-01-07*

Amazing calculator, love the hms conversion option!

### 5/5 — An awesome app for CM-100 calculator fans!

*2019-11-19*

Brilliant to have this app available. The CM-100 is an excellent and unique computer math calculator ideal for assembly programmers and retro computer enthusiasts, and this app means anyone with an iPhone can enjoy having one readily available for use in their work or just to play around. 5 stars!

### 5/5 — Does not work with IOS 12

*2018-09-22*

Love this calculator and it stopped working after IOS 12 update. 😞

### 3/5 — It's OK.

*2016-08-25*

I have a cm100 (from the eighties) and its a fantastic calculator for programmers. Mine still worked perfectly until the other day when the "A" key fell off. I was hoping this would be a good replacement. Its just OK. One of the most annoying things is that when you push the HEX, BIN, OCT keys it doesn't put populate the display with the leading zeros. For some reason that really bugs me. I also enjoy emulators that go the extra mile. For instance, the cm100 puts a little +,-,* etc on the right hand side of the screen when using those. This doesn't, it has a really annoying text box at the top which looks awful and ruins the whole feel of the app.

## Frequently asked questions about CMCalc

### What functions does CMCalc perform?

CMCalc performs simple decimal arithmetic, basic binary conversions (decimal, binary, octal, hexadecimal), and binary logic functions. It also supports operator grouping with parentheses for complex calculations.

### Does CMCalc have ads?

No, CMCalc is ad-free. It does not contain any advertisements, providing an uninterrupted user experience.

### What devices is CMCalc available on?

CMCalc is available for iPhone and iPod devices. It supports landscape mode on devices with 4-inch or larger screens.

### How often is CMCalc updated?

The latest version of CMCalc is 1.3, last updated on February 13, 2026. While the release date was March 12, 2015, the last update indicates ongoing maintenance.

### What is the age rating for CMCalc?

CMCalc has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Can I input hexadecimal numbers in CMCalc?

Yes, CMCalc supports hexadecimal calculations. The input keys include A through F for hexadecimal number entry.

### What makes CMCalc different from a standard calculator?

CMCalc emulates a specific 1980s Casio model and includes binary conversion and logic functions not found on basic calculators. It also offers modern features like copy/paste and landscape mode.

### What is the user sentiment for CMCalc?

CMCalc is highly rated, with an average of 4.5 stars from 6 ratings. This suggests a positive user experience and satisfaction with its functionality.

## Version history (last 4 releases)

### 1.3 — 2026-02-13

Version 1.3 of CMCalc introduces support for hardware keyboards. The primary display font was redesigned to more closely resemble that of the original calculator. Pressed buttons now flash in all views.

### 1.2 — 2023-01-29

In version 1.2, when viewing the image of the original calculator, the clickable areas for all buttons have been expanded to enhance usability.

### 1.1 — 2018-11-15

Version 1.1 includes leading zeros when using the binary logic modes (HEX, BIN, OCT, DEC), and will also now display the arithmetic symbols (÷, x, -, +) when these functions are pressed.  Both of these additions make the CMCalc application more consistent with the original CM-100 computer math calculator.

### 1.0 — 2015-03-12

No release notes.

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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.*