What is wrong with this VBscript in the field calculator?


if [ColumnB] > 0 then
    [ColumnC] = [ColumnA] / [ColumnB]

Each time I receive this syntax error message:

Error 000539: SyntaxError: invalid syntax (expression, line 1) Failed to execute

All 3 columns are the double field type, although they vary in precision and scale. I have tried converting the columns to float type and doing the same expression. I received the same error messages.

For the first line (starting with 'if'), the script is left-justified. For the second line (starting with '[ColumnC]) I included four spaces before the script. In the codeblock on the field calculator the equation does extend into the third line (and is left justified) simply because the actual name I use for !ColumnB! is longer.


1 Answer 1


You need to pass the returned value in a variable, not reference the column itself.




if [ColumnB] > 0 then
    result = [ColumnA] / [ColumnB]
    result = 0
end if

Here's how the two parts fit together in the field calculator - my data doesn't have the same field names, but you get the idea.

enter image description here

  • 1
    Are you using the codeblock? The expression should be just "result" and the codeblock is the rest. VBScript doesn't care about indentation.
    – phloem
    Feb 25, 2015 at 23:14
  • 2
    bubbalouie Please add a screen shot of your field calculator to your question, there are a few things that would be explained by that. @phloem, if you do the same that should clear it up. Feb 25, 2015 at 23:18

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