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 FileMaker Pro Custom Functions

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Phone#Format ( Phone )

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  Average rating: 3.7  (47 votes)
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Steve Bush, Intellisoft Development

Formats a 7 or 10 digit phone number

Sample Input:
Phone#Format ( 7025551234 )
Sample Output:
702 555-1234

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


Formats a 7 digit or 10 digit phone number. First removes a leading '1' and all alpha characters. If the result is neither 7 nor 10 digits, the phone number is displayed in red text. This function uses a space between the area code and the number, so it takes up the minimal amount of room.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


Thanks for this custom functions. I am new to filemaker and it helped me a lot. I have one question. How should I modify the calculation to accommodate phone numbers with area codes starting with the number 1. (ex. 108 222-2222).

Thanks a lot for the help.

Olia, Montreal
February 07, 2014 11:17am

I believe that this phone format function is primarily for US and Canada, neither of which us 1 to start an area code. However if you comment out the 2 "num" line that should do it.

// num = Case(Left(num;1)= "1"; Middle(num;2;20); num);

Thomas, Pittsbugh
February 16, 2014 6:59am

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