Am/G is G, A, C and E. The shape this page opens on is written 302210, lowest string first.

Also written Am over G or Am with G in the bass. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 3 common shapes for Am/G on the guitar.
In which keys. Every note of Am/G belongs to C major (the vi), D minor (the v), E minor (the iv), F major (the iii), G major (the ii) and A minor (the i).
The common shapes, written lowest string first: 302210, 332555, xx5555.
The common shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.