G major has 1 sharp — F♯. 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. G major's final sharp is F♯, and a semitone above that is G — the key. Count 1 sharp and you have G major every time.
The G major scale runs G, A, B, C, D, E, F♯. 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.
G major shares its signature — 1 sharp — with its relative minor, E 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.
G major has 1 sharp — F♯.
The relative minor of G major is E minor — it shares the identical key signature (1 sharp).
The G major scale is G, A, B, C, D, E, F♯.
Keep practicing: key signature quiz · circle of fifths · key trainer
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