How to read a guitar chord diagram

Chord diagrams are how guitarists communicate fingerings on paper. Once you know the conventions, any songbook or chord chart becomes immediately readable.

What you're looking at

A guitar chord diagram is a stylized picture of a guitar fretboard. The vertical lines are strings, and the horizontal lines are frets. The thick line at the top represents the nut — the white bar at the top of your guitar where the fretboard meets the headstock.

The strings run from low to high, left to right. The leftmost vertical line is your low E string (the thickest one); the rightmost is your high E string (the thinnest). This matches what you'd see if you were looking down at your guitar from above, holding it normally.

The dots

The black dots on the diagram are the notes you press down. Each dot sits on a specific string and a specific fret. To play the chord, you press your finger on every fret-string position marked with a dot, then strum.

Many diagrams include a number inside or below each dot — that's the finger number:

• 1 = index finger
• 2 = middle finger
• 3 = ring finger
• 4 = pinky
• T = thumb (rare; used for some folk and country styles)

These are suggestions, not commandments. Experienced players often deviate when a different fingering makes a transition smoother.

Open strings and muted strings

Some diagrams include indicators above the nut for what to do with the strings that aren't fretted:

• O (or a circle) above a string means play it open — strum it without fretting.
• X above a string means mute it — don't let it ring. You can mute a string by lightly resting another finger against it, or by simply not strumming it.

For example, a standard C major chord diagram shows X on the low E string (don't play it), O on the high E (play open), and dots for the other notes. If you strum all six strings on a C chord, the low E will sound the wrong note and muddy the chord — that's why the X matters.

Fret numbers

For chords played near the nut (the first 3-4 frets), the diagram doesn't need a fret number — it's understood that the top of the diagram is the nut.

For chords played higher up the neck, you'll see a small number to the left of the diagram (or sometimes to the right) indicating the fret number of the topmost displayed fret. "5fr" means the diagram starts at the 5th fret. The thick line at the top is no longer the nut in this case — it's just the boundary of where the diagram begins.

Barre indicators

A barre chord is one where you press multiple strings down with a single finger laid flat across the fretboard. In diagrams, this is shown as a curved line, a thick horizontal bar, or a series of dots connected by a line, all on the same fret.

Most barre chords use the index finger to barre. The barre symbol in the diagram tells you how many strings are covered. A "full barre" covers all six strings; a "partial barre" covers only some.

Barre chords are physically harder than open chords because you need consistent finger pressure across multiple strings. They're worth learning because they're movable — once you know the F major barre shape on the first fret, you can shift the same shape up to the third fret to play G, the fifth to play A, the seventh to play B, and so on.

What's the "R"?

Some diagrams (including the ones in the MusoKit chord finder) mark certain dots with an R — that's the root of the chord. Knowing where the root is helps you understand the chord's structure and makes it easier to find the same chord in different positions on the neck.

The root is the note the chord is named after. In a C major chord, every "C" note in the voicing is a root. The root is usually the lowest note you'd play in a chord (especially in classical voice-leading), but not always — guitar voicings often invert the chord and put a different note in the bass.

Putting it together

Take a standard G major diagram as an example. Reading from low E to high E:

• Low E (leftmost): dot on the 3rd fret, finger 3 (ring) — that's a G note, the root.
• A: dot on the 2nd fret, finger 2 (middle) — that's a B.
• D: open (O) — that's a D.
• G: open (O) — that's a G, the root again.
• B: open (O) — that's a B.
• High E (rightmost): dot on the 3rd fret, finger 4 (pinky) — that's a G, root again.

You hold this shape, strum all six strings, and you've played a G chord — three notes (G, B, D) repeated across six strings, which is what gives a strummed open chord its rich, full sound.

Other instrument diagrams

The same conventions extend to ukulele (4 strings instead of 6) and bass (4 or 5 strings, an octave lower than guitar). Read the same way: vertical lines = strings, horizontal lines = frets, dots = pressed positions.

Piano "diagrams" look completely different — they show the keyboard from above with highlighted keys for the chord — but the principle is the same: the diagram tells you which notes to play, and the chord name tells you what to call the result.

The chord finder lets you compare the same chord across all three instruments at once — useful when you're learning a song from a chord chart and want to see how the same chord lays out on different fretboards.