All in One (aio) Calculator is the most complete calculator in the App Store. Ideal for every day use or more complex needs. Still free and without ads. It's an easy to use and modern calculator with a unique combination of features.

General features
• Available on all iPad, iPhone and iPod devices
• Multitasking
• Full support for drag and drop
• Classic and Dark color themes
• Quick Guide for easy onboarding
• Tool bar for easy access to many features
• Accessibility features like VoiceOver
• Home screen icon for quick actions (3d Touch)
• Delete button for easy editing
• Undo and redo
• Adjustable precision for decimal results
• Spotlight Search

Calculator Views
• Views for Standard (Infix), RPN and Programmer
• Statistic functions (average, standard deviation and more)
• Expression editing
• Share results; including using AirDrop
• Common memory functions
• View contents in memory
• Multiline expression in portrait and landscape
• Simple layout in portrait and a more advanced layout in landscape
• All calculator functions available in portrait (don't need to rotate the device)
• Various button styles
• Change location of number pad for better accessibility

Unit Converter
• Convert among the 481 units in 36 measurements; including currency
• Share results with others or paste back into the calculator for further use
• Hide units seldomly used

• History (paper tape) feature allows you to see and use previous calculations
• Annotate history entries to remember what they were
• Search in history
• Share results with others or paste back into the calculator for further use

Info feature
• Detailed description of all features
• Table of contents and search allow you to find topics of interest

• Shows as many rows in the stack as needed
• Shows the expression that generates the result
• Drag and drop among rows
• Buttons to manipulate the stack

• Support for hexadecimal, octal and binary number systems
• Manipulate individual bits
• Many bitwise operators
• Shows equivalents ASCII and Unicode characters

• Fractions can be converted to different forms; including decimal
• Fraction keys can be changed to other keys in portrait mode
• Works with decimal numbers and fractions

You no longer need a fractions calculator and decimal calculator; nor a unit converter. Future upgrades will add more features so you don’t have to switch back and forth among other apps.

We hope you enjoy aio Calculator.

What’s New

Version 8.1.3

Thank you for using our app. It's regularly improved and modernized to better serve you.

Recent changes include:
• Unit converter would sometimes crash on startup
• General improvements and corrections

Ratings and Reviews

4.6 out of 5
70 Ratings

70 Ratings

Grivas85 ,

Best iPhone calculator app !

Wow this app is amazing.. great for history of calculations.. sharing calculations.. and also converts units of measurements pretty easy.. speaking of converting units of measurement.. you should check out Converter app from this same developer

Hot-mama-from-Cartagena ,


Nice job! I love how I can change the layout of numerical keypad.
And the unit conversion feature.

Wncranger ,

Deserves a look!

This calculator app deserves a closer look. It is packed with features and is free!


Ramon Rivas
184.6 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Spanish

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like