To play the G7 chord, place the middle finger on the 2nd fret of the C-string, index finger on the 1st fret of the E-string, and ring finger on the 2nd fret of the bottom A-string. Let the other string ring open.
G7 Ukulele Chord Explanation
The G7 chord contains the notes G-B-D-F.
To build a G7 chord, take the dominant seventh formula (1-3-5-b7) and apply it to the G major scale (G, A, B, C, D, E, F#).
Identify the first, third, fifth, and flat seventh scale degrees in the G major scale which are G-B-D-F.
Notice how the seventh scale degree found in the chord is lowered a half step as indicated by the "flat" or "b" that precedes the number "b7". In this case, the seventh scale degree of an G major scale – an "F#" note is lowered a half step to an "F" note to make the chord a dominant seventh chord.
Watch the following video to learn how to play an G7 chord on ukulele.