"That's fine for me" OR "That's fine by me"?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hello!

Which one is correct? “That’s fine for me” OR “That’s fine by me”? and why?

Thanks

2

Hi,

‘That’s fine for me’ suggests that what you have given me (say a drink or a plate of food) is all right for what I need. ‘That’s fine by me’ suggests more generally that that is all right as far as I am concerned. That could refer for example to an arrangement or a decision that has been made by others and these others want to know whether you agree.

Alan

3

I see.
I always used to say ‘That’s fine for me’ when somebody asked me for my agreement to some proposal, say, meeting at some place at a specified time.
I should have said ‘fine by me’ instead.
Thanks for the question and clearing it.