I am working on a street addressing project. I want to add a number to every odd number. Example if [field] is odd [field]+=1. How can I do this in ArcMap using the field calculator.

I used to work programming in Microsoft Visual Basic And C++.But how can i do this in Arc Map field calculator.

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What is wrong in this expression.

I used the expression that Ali Put. But still I am Having errors.

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  • 3
    Select using Mod(fld,2)=0
    – FelixIP
    Feb 16, 2017 at 8:32
  • I've updated my answer to include the field expression. You had that part right in the first image.
    – Ali
    Feb 16, 2017 at 9:35

1 Answer 1


You're almost there. The modulo operation in Python is carried out using the % operator i.e.

>>> print 3 % 2

Incorporating this into your function:

def calc(val):
    if val % 2 > 0:
        return val + 1
        return val

Then underneath the codeblock, in the field expression:


The field calculator will take the value from the LR field and push it into the calc function. If it is odd, the value will be incremented by 1 and returned, otherwise the input value will be returned without modification.

  • Val + (Val ℅ 2) will do
    – FelixIP
    Feb 16, 2017 at 18:50

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