With 45 categories and over 1400 units, Calvertr is one of the most extensive applications on the app store.

“Calvertr : A unique calculator and conversion app”

"Calvertr - perform conversions quickly"
- appPicker

Calvertr is simple, easy-to-use and fully featured unit converter and calculator to handle any conversion you'll ever need.

Calculate and share mathematical operations with powerful widget in real time.

Beautifully packaged Calvertr is compatible with latest ios and devices.

Units Converter:

• Eye-appealing graphics and designed to be fast and user friendly
• 45 ready to go categories with more than a thousand units
• Support of 157 world currencies
• Simply add units to your favorite list and access directly from home screen
• Ability to search units and categories
• Add personal notes with each saved conversions and share it with your friends through Email or Airdrop or easily print it


• Simple and elegant user interface with gorgeous background
• Create live math expression
• Automatically save your complete expression for future use
• Use backspace anytime to correct a simple mistake, instead of starting over
• Tap on math expression to edit and add your notation to each number
• Share complete calculation with your friends through Email or Airdrop or Print it
• Optimized to be faster and easy to use calculator

Widget Notifications Center :

• First time ever you can make your mathematics calculations at your notification center as Widget, exclusively designed for latest iOS
• Your favorite conversion on the go with newly practically designed Converter widget.

Available Units:

Acceleration, Angle, Area, Astronomical, Business Days, Calendar Days, Capacitance, Cooking, Currency, Clothing, Data, Density, Electric Current, Energy, Force, Frequency, Fuel Consumption, Length, Light, Mass, Mortgage Payment, Percentage, Power, Pressure, Radioactivity, ROI, Sound, Speed, Split Check, Temperature, Time, Tip Calculator, Torque, Viscosity and Volume and many more.

Full compatibility, starting from iPhone 4s upto iPhone 6s plus with iPad, including support of iOS 7 and later.

Come and download this unique, one-of-a-kind application. We'd love to hear your comments or suggestions.

What's New

Version 2.3

• Subtle performance improvements

Ratings and Reviews


The converter app I have been waiting for ..

This is the most comprehensive app on the app store. I was using four different apps to make various conversions, this replaces them all. Calculator is nice addition. It makes it easy to use converted numbers for further calculation. As far as I know no other app does it. Widgets are cool as well. App allows you to change decimal points on each tap. That is kind of cool. It makes it look uncluttered but also allows you to view accurate numbers when needed. Clever! Overall navigation takes little time to get used to, but help and on screen notations will make it easier. Worth every penny.



Interface revels in being different, but it's difficult to use in practice. As mentioned by others, the calculator widget is hopelessly inaccurate. Waste of a purchase.


Crashes upon opening

I want a refund this app worked flawlessly until the iOS 8.3 update so please fix


ReasonX, Inc.
21.3 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© ReasonX
In-App Purchases
  1. Unlock All Themes $0.99


  • Family Sharing

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

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