Convert 15-char to 18-char IDs in Apex

I was working with someone recently who saw how I converted 15 character IDs to 18 character IDs in Apex and thought it was clever. I always thought it was something everyone knew, but just in case, I’m posting it.

All I am doing is using the ID datatype, which does it for you automatically. You just have to trap the StringException in case you get passed a string that isn’t an ID. Anyone else do it another way?

string s = '0013000000K7WW2';
   ID sID = s;
   // if we get here, it's a valid ID and the sID field is an 18 character one
} catch (System.StringException e){
   // if it goes here, it's not an ID. Do something if you need to.


  1. Prasanna Said,

    August 23, 2010 @ 8:17 pm

    Awsome! Many people like me must not be knowing this… Thanks for sharing this.

  2. Jon Mountjoy Said,

    August 23, 2010 @ 11:32 pm

    Oh very nice!

  3. Francis Said,

    August 24, 2010 @ 3:47 am

    Cool! On a side note I’ve been hunting for ages for the formula to convert the 15 and 18 char IDs. I know I watched how to do it in the iTunes training videos but have no idea which one… you don’t happen to know what it is?

  4. Scott Hemmeter Said,

    August 24, 2010 @ 7:49 am

    @francis. sorry, no idea.

  5. Jonathan Keener Said,

    August 24, 2010 @ 8:06 am

    Below is an excel VBA function with the logic in it. It’s always worked well for me. I got it out the the old Excel Connector code.

    ‘ Converts a 15 character ID to an 18 character, case-insensitive one …
    ‘ got this one from sforce community
    ‘ thanks go to Scot Stoney

    Function FixID(InID As String) As String
    If Len(InID) = 18 Then
    FixID = InID
    Exit Function
    End If
    Dim InChars As String, InI As Long, InUpper As String
    Dim InCnt As Integer

    InCnt = 0
    For InI = 15 To 1 Step -1
    InCnt = 2 * InCnt + Sgn(InStr(1, InUpper, Mid(InID, InI, 1), vbBinaryCompare))
    If InI Mod 5 = 1 Then
    FixID = Mid(InChars, InCnt + 1, 1) + FixID
    InCnt = 0
    End If
    Next InI
    FixID = InID + FixID
    End Function

  6. Rhonda Ross Said,

    August 24, 2010 @ 10:54 pm


    Not sure if this is what you saw, but if it was a video about using Excel Connector with Salesforce, the function is FixID().

    As an example, if you have a 15 character ID is cell A1, if you put the formula FixID(A1) into cell B1 the 18 character ID would be displayed in cell B1.

  7. Joey Chan Said,

    September 2, 2010 @ 7:56 pm

    You could also check out this snipplr link on a way to convert 15 char to 18 char using Apex.

    It came from the apex-lang package

  8. Rodrigo Juliani Said,

    August 2, 2011 @ 6:38 am

    Thanks for the tip. It really saved my life.

  9. km Said,

    March 22, 2012 @ 9:51 am

    This is a very nice post, i was doing it by looping over the digits and with all the logic in the code to convert it to 18 digit. This was so simple all the time…feel like a dummy

  10. askmrlee Said,

    August 27, 2012 @ 3:17 pm

    I have Excel Connector installed, and I can convert 15 character IDs to 18 character IDs using =FIXID(cell reference). However, I have a column with almost 100,000 rows and =FIXID seems to work only for cells lower than row 65,536. Anything above returns a #VALUE error. I’m using Excel 2007. Any workaround other than splitting the list into two?

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