Assuming you mean F major, then the answer is one flat.
There are no flats in Em, just an F sharp!
The F minor scale has four flats.
One, Bb. 1, the flat is B flat.
The key located just to the left of F major on the circle of fifths is C major. C major has no sharps or flats, while F major has one flat (B♭). The key with more flats than F major is D♭ major, which has five flats.
The G major key has one sharp, which is F#. In terms of flats, G major does not have any flats. This key signature is commonly used in various musical compositions and is often one of the first keys taught to beginner musicians.
One, Bb. 1, the flat is B flat.
There can be a total of seven flats (or sharps) in a key signature.
1, Bb.
"Fm" is shorthand for the key of F minor, a key signature with four flats.
When adding flats to a key, the order is B, E, A, D, G, C, and finally F. With sharps, it's the exact opposite.
F major, B-flat major.
None, only flats. B flat in F major, B, E, A, and D flat in F minor.