1

How can i convert a field 1,2,3,4... to 001,002,003,004...010...?

For example

1 change to 001
2 change to 002 
3 change to 003

...

Is there any formula in field calculator?

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2

Use Field Calculator with Python parser and the zfill method:

Pad a numeric string s on the left with zero digits until the given width is reached

Pre-logic script code:

def pad(code):
    return str(code).zfill(3)

And call with:

pad( !Code!)

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1

Another solution in Field Calculator with Python parser could be achieved with the use of zero padding and width flags

def oldblock(code):
    return "%03d" % code

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