# Calculator!! — Improved History Feature

> Advanced calculator with history, fraction, angle, and equation solving features. (iPhone/iPad app by Dogahe.)

- Source: https://appshunter.io/ios/app/calculator/id504198225 (this page in markdown: same URL + `.md`)
- Developer: [Dogahe](https://appshunter.io/developer/468657946)
- Category: Utilities, Education
- Price: $2.99
- Rating: 4.40/5 from 56 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 12 MB
- Languages: American English
- Released: 2012-02-28
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/calculator/id504198225/reviews.md

## What is Calculator!!?

Calculator!! has the following additional functionality compared with most available calculators: 

- Shows the expression as you enter and keeps a history of your calculations (Swipe up on the screen to access the history.)
- Capability of performing fraction manipulations and converting between different formats (proper, improper, and mixed fractions) and seamless integration of fraction, integer, and decimal manipulations. 
- Capability of inputting degrees, minutes, and seconds for angles and converting between degrees-minutes-seconds format and decimal format. 
- Capability of calculating permutation, combination, Least Common Multiple (LCM), and Greatest Common Divisor (GCD). 
- Quadratic and system of two linear equations solver 
- Rectangular to polar and polar to rectangular coordinate conversion (extremely useful for phasor calculations for electrical engineers) 
- Throws a set of dice (choice of 1 die to 4 dice) 
- Backspace to delete last digit entered. 
- Tip Calculator
- Geometry Calculator 
- The left pane scrolls to reveal more functionality without a need to switch modes. The digits and most common operations are always visible and the less common operations can be revealed by scrolling the left half of the screen. 
- Sinusoidal functions can be calculated for angles in units of degrees, radians, or gradians. 
- Showing the content of memory on MR button, as long as it fits. 

Calculator!! is an ongoing project and we are working on more features and functions to be added to every update of the app. 

You are going to love the simplicity of the user interface and you will get used to the extra functionality added to this product. 

Please do not hesitate to contact us for any questions, comments, to report any bugs, or to suggest additional functions you would like to see in the upcoming updates.

## Key features

- Calculation history
- Fraction manipulation
- Angle conversions (degrees, minutes, seconds)
- Permutation, combination, LCM, GCD
- Quadratic and linear equation solver
- Coordinate conversion
- Dice roller

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/calculator/id504198225/reviews.md

### 5/5 — Updated Review 9-26-20

*2020-09-26*

I’m glad that the developers listened and added “history “ to the app. It’s so much useful now. Thank you!!

**Developer response:** We have updated the app to address your feedback. Now history of calculations persists through sessions of the app. You can always go back in your calculations to look up something. You can also delete each row of the calculations or delete all calculations that are older than a certain calculation in the history. While we were at it we added a Tip Calculator in the portrait mode. Simply enter the check amount and tap on Tip. Also there is support for Dark Mode if you are using iOS 13.

### 1/5 — Weird calculations

*2020-05-26*

I did 4.85-4.562 and got an answer of 0.279999999999999999

That makes the calculated very unreliable since I use calculations of degrees and minutes to several decimal places and continue calculations from one sum to the other without rounding or retuning from scratch.

In response to the app developer - my exams for navigation and ship stability require stupid levels of precision. If it doesn’t provide the exact number on a simple 3dp subtraction how can I have confidence in spherical trigonometry calculations? It seems like nothing and in the real world it is nothing but in my exams which will certify me to be a Master Mariner they need to be precise in calculation and then reasonable in final answer.

**Developer response:** If you did 4.85-4.562, yes you may get 0.287999999. But can you please be more specific on when this makes the calculations unreliable? Can you please go on with the rest of your calculations and tell us where you will end up with an unreliable answer? The fact that calculator shows 4.85-4.562 = 0.287999999 is because of using floating point type. There is no precise representation of decimal number with floating point types in a computer. But still this should not cause you any unreliable answers. So please let us know where this leads into giving you a wrong answer at some point? 

If you convert 0.287999999999 to degrees and minutes you will get 17' 16.8'', which is the same result as if you converted 0.288 to degrees and minutes.

### 5/5 — Great update

*2019-01-14*

Love the newly added triangle and rectangle calculator. Thanks for such a great calculator.

### 3/5 — How do you convert numbers into fractions?

*2018-09-04*

Pls help

**Developer response:** Please email us at calc@dogahe.com with questions regarding functionality of Calculator!!

### 5/5 — Great scientific calculator

*2013-07-25*

Great calc with very unique features like fractions and degree minutes conversion.

### 5/5 — Calculator

*2013-04-19*

Great scientific calculator! Fractions and degrees minutes second conversion are great features and hard to find in an all in one calc app.

### 5/5 — President of CamaPlan

*2012-03-24*

Greatest calculator. I am so amazed how much this calculator does compared to the ones I bought at Cornell for hundreds of dollars TI. Awesome.

### 5/5 — BEST Calculator app everrr!!!

*2012-03-22*

I have downloaded so many calculator apps out there, however this one by far is the BEST!! I recommend it strongly..

## Frequently asked questions about Calculator!!

### What makes Calculator!! different from other calculators?

Calculator!! stands out with its extensive history feature, allowing you to review past calculations. It also offers advanced functions like fraction manipulation, angle conversions, and equation solvers not found in basic calculators.

### How can I access the calculation history in Calculator!!?

You can easily access your calculation history by swiping up on the screen. This feature helps you keep track of all your computations.

### Does Calculator!! support different angle units?

Yes, Calculator!! supports sinusoidal functions for angles in degrees, radians, or gradians. It also allows conversion between degrees-minutes-seconds and decimal formats.

### Can Calculator!! solve equations?

Absolutely. Calculator!! can solve quadratic equations and systems of two linear equations. It also calculates permutation, combination, LCM, and GCD.

### Is Calculator!! suitable for electrical engineers?

Yes, Calculator!! is extremely useful for electrical engineers due to its rectangular to polar and polar to rectangular coordinate conversion capabilities, which are vital for phasor calculations.

### Does Calculator!! have ads?

No, Calculator!! does not contain advertisements. It is a paid app that provides an ad-free experience.

### What is the price of Calculator!!?

Calculator!! is available for a one-time purchase of $0.99.

### On which devices can I use Calculator!!?

Calculator!! is supported on iPhone and iPod devices.

## Version history (last 5 releases)

### 2.39 — 2025-09-16

Bug fixes

### 2.38 — 2022-07-17

We added the capability to copy/paste since it was a popular demand from our beloved users.

### 2.37 — 2021-04-07

Added buttons in the portrait orientation for easier access to History, and Geometry features.

### 2.36 — 2019-11-16

- Now history of calculations persists through sessions of the app. You can always go back in your calculations to look up something. You can also delete each row of the calculations or delete all calculations that are older than a certain calculation. 
- Now you have a Tip Calculator in the portrait mode. Simply enter the check amount and tap on Tip. 
- Support for Dark Mode on iOS 13.

### 2.35 — 2019-09-06

Geometry Calculator now available for all users of Calculator!!

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All apps by Dogahe: https://appshunter.io/developer/468657946

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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 2026-08-26.*