How do you say in my opinion in french?

In my opinion is 'Ã mon avis' in French. you can also use 'dans mon opinion', but I'll say we would use that in serious subjects.

Ex: Ã mon avis, ta jupe est trop courte (in my opinion, your skirt is too short).

Ex2: Dans mon opinion, le ministre des finances a pris une mauvaise décision (in my opinion, the finance minister has taken a wrong decision)