# Effect size for goodness of fit chi-square

I would like to assess the effect size of a goodness of fit chi-square test. I have a variable that can have 3 states and test against a custom expected value. I used a variation Cramér's V for a goodness of fit test. However I have no idea what signifies a small/medium/large effect. There are conventions that vary with the degrees of freedom... however, since I did not use Cramér's V for a normal chi-square test but for a goodness of fit test I am lost...

Any idea or reference would be very much appreciated :)