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CalPad - Help & FAQs

What is CalPad?

What is the difference between CalPad & CalPad+?

How do I do calculations?

Operators & Precedence

How do I add notes?

Why do I get ?! after pressing = sign?

Why do I get NaN after pressing = sign?

What math functions are supported?

How do I start a new file?

How do I open a file?

How do I save a file?

How do I share the notes?

How do I contact support?


What is CalPad?

CalPad is a calculator and a notepad combined in one app. It helps you do calculations and take notes along side. You can save them to a text file on the device or share them via email or online.

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What is the difference between CalPad & CalPad+

CalPad is an ad supported version of the CalPad+ app. CalPad doesn't offer all the math functions supported by CalPad+. To use the app without limitations please upgrade to CalPad+ at Windows or Windows Phone Store.

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How do I do calculations?

You enter numbers and operators just like you do in a typical calculator and when you press the = sign the app automatically calculates the result and enters it after the = sign. You can use the result to do more calculations and chain more equations. You can use functions as part of your equations and even nest them within other functions.
Here are some examples:

  5.79 + 3.87 = 9.66 / 3.42 = 2.82456
  (146 - 34) * 84 = 9408
  146 - 34 * 84 = -2710 * cos(1.025) = -1406.75798
  abs(tan(6)) = 0.29101

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Operators & Precedence

Operators are evaluated in the following order: ^ * / + -. You can override this order by using () around operators with lower precedence.
Here are some examples:

  5 + 4 / 2 = 7
  (5 + 4) / 2 = 4.5

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How do I add notes?

You can type notes anywhere in the file, even right after a calculation. When starting a calculation begin a new line by pressing the enter key. If you enter notes in the same line as the calculation but before the = sign the you will get a ?! indicating an error. Starting the calculation in the next line will get you results!
Here are some examples:

  15.35 * 4 = 61.40 inches of plywood, need to confirm
  15.35 inches * 4 = ?! won't work

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Why do I get a ?! after pressing = sign?

If there is an error in the equation you will get a ?! after the = sign. You can fix the error and type the = sign again to get the result. Currently the app doesn't support letters (or variables) along with numbers in calculations. The following symbols are allowed in calculations: $ ¢ £ € ¥
Here are some examples:

  5.35 euros * 4 = ?! won't work
  $5.75 * 7 = 40.25
  850000 - ¥784253 = 65747

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Why do I get a NaN after pressing = sign?

NaN stands for 'not a number' meaning the result is undefined. For example if you try to find the square root of a negative number the app will return a NaN.
Here are some examples:

  acos(5) = NaN
  sqrt(-4) = NaN

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What math functions are supported?

Currently the following functions and notations are supported. Click here for more details on how to use them. You can insert them using the red function key in the keypad or type them directly.

  e
  exp( )
  ln( )
  10log( )
  ( )log( )
  pi
  sqrt( )


CalPad+ functions:

  abs( )
  acos( )
  asin( )
  atan( )
  cos( )
  cosh( )
  sin( )
  sinh( )
  tan( )
  tanh( )

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How do I start a new file?

In Windows Tablet/PC click the 'New' button to start a new file. You will be prompted to save any unsaved notes before starting a new file.

In Windows Phone select all the text by pressing and holding the notes area. Then click the delete key to start over.

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How do I open a file?

In Windows Tablet/PC you can only open and edit plain text files (usually ends with .txt). You can use the 'Open' button within the app or use Windows Explorer to open a text file. In Windows Explorer select CalPad or CalPad+ in the 'Open with' dialog to open the file.

Windows Phone 8 does not allow access to the file system, so you will not be able to open, edit or save files like you do in Windows Tablet/PC. Please use the email share option described below to save your work in an email.

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How do I save a file?

In Windows Tablet/PC use the 'Save' button to save the notes. When starting a new file the app will prompt you to save any unsaved notes.

Windows Phone 8 does not allow access to the file system, so you will not be able to open, edit or save files like you do in Windows Tablet/PC. Please use the email share option described below to save your work in an email.

You notes are saved automatically (to the app's local storage) as you type in both Windows Tablet/PC and Windows Phone versions. However we highly recommend that you save the notes externally in a file or email, or you'd risk losing your work when upgrading or uninstalling apps.

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How do I share the notes?

In Windows Tablet/PC use the Share charm by swiping from the right) to select from one of the several options available in your device to share your notes. Depending on the software installed in your device, you could share the notes via email or other online services.

In Windows Phone use the 'Share' button to share the notes via email.

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How do I contact support?

Please send an email to appestry@live.com with your questions and feedback. All emails will be responded typically within 24 hours.

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