F♯ major has 6 sharps — F♯, C♯, G♯, D♯, A♯, E♯. Here's the signature on the staff, the full scale, its relative minor, and the trick to recognize it instantly.
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The fastest way to spot a sharp key is the last sharp: it always sits a semitone below the tonic. F♯ major's final sharp is E♯, and a semitone above that is F♯ — the key. Count 6 sharps and you have F♯ major every time.
The F♯ major scale runs F♯, G♯, A♯, B, C♯, D♯, E♯. Every sharpened note in the piece takes the key's accidentals automatically, which is exactly what the signature saves you from writing note by note.
F♯ major shares its signature — 6 sharps — with its relative minor, D♯ minor, a minor third below the tonic. They use the same seven pitches; what tells them apart is which note the music settles on and treats as home.
F♯ major has 6 sharps — F♯, C♯, G♯, D♯, A♯, E♯.
The relative minor of F♯ major is D♯ minor — it shares the identical key signature (6 sharps).
The F♯ major scale is F♯, G♯, A♯, B, C♯, D♯, E♯.
Keep practicing: key signature quiz · circle of fifths · key trainer
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