How do you say 'I am fine' in Finnish?

Answer 1

I am fine is "Voin hyvin" if you mean like an answer to the question, "How are you?". But if you mean "I am good," it´s "Olen hyvä. "

Minä olen hyvä matematiikassa.
Minä olen hyvä soittamaan kiitaraa.

Grammar:
OLLA HYVä + INESSIIVI (-SSA/-SSä) [if its a noun]
OLLA HYVä + ALLATIIVI (-MAAN/-MääN) [IF ITS A VERB]

Answer 2

It depends on if it is a response to the question "How are you doing?" or if it is a response to "Are you OK?"

If it is a response to the first, then I am fine is "Hyvin", if the latter, then it is "Olen kunnossa".