On guitar, the fingers of the fretting hand are numbered 1 to 4: the index finger is 1, middle finger 2, ring finger 3 and little finger 4. The thumb is generally not included in this numbering system.
For right-handed guitarists, this refers to the left hand. For left-handed guitarists, it refers to the right hand.
These finger numbers appear throughout guitar lessons, chord diagrams, scale fingerings, TAB and standard notation. Learning them correctly makes it much easier to understand written fingering instructions and practise new material efficiently.
On the fretting hand, the four fingers are numbered 1 to 4. The thumb is not given a number and is usually indicated with T.
Remember: T = thumb, 1 = index, 2 = middle, 3 = ring, 4 = pinky.

When a guitar teacher, method book or piece of notation says “play this with finger 3” or “use fingers 1–2–4,” those numbers tell you exactly which fretting-hand fingers to use.
Using the correct fingering can:
As guitar parts become more complex, choosing the right fingers becomes increasingly important. Good fingering reduces unnecessary movement and makes difficult passages easier to repeat consistently. For the basic mechanics behind this, see left-hand guitar technique and fretting-hand basics.
The standard finger numbering system for the fretting hand is simple:

The thumb is normally not included in the 1–4 numbering system. In some guitar notation and techniques, the thumb may be indicated separately with a T.
For right-handed guitarists, these numbers refer to the left hand. For left-handed guitarists, the same numbering system applies to the right hand.
You will see these numbers in guitar method books, exercises, chord diagrams, scale fingerings, TAB and standard notation. They tell you which fretting-hand finger should play a particular note or position.
Finger numbers are used whenever a guitarist needs more information than simply which note or which fret to play. They tell you which fretting-hand finger is intended for that note.
You may see finger numbers:
One important distinction: the numbers written on the TAB lines themselves normally indicate fret numbers, not finger numbers. A 3 on the TAB means “play the third fret”; it does not automatically mean “use finger 3.” Fingering numbers are usually shown separately.
Once you become familiar with the 1–2–3–4 system, you can look at a written passage and understand much more quickly how the notes are supposed to sit under the hand. That becomes especially useful when learning scales, position shifts and more complicated riffs.
Once you understand the finger-numbering system, you can apply it while exploring scale shapes and fretboard positions with FRETTR.
The numbering system itself is simple, but beginners often make a few predictable mistakes when they start using it in real music.
The thumb is a good example of why context matters. In some blues and rock styles, players wrap the thumb over the neck to fret bass notes or mute strings. You can see that kind of fretting-hand approach in Jimi Hendrix chord and playing technique.
The goal is not to obey finger numbers mechanically. They are there to help you find a fingering that is efficient, repeatable and appropriate for the musical phrase.
Explore more essential playing fundamentals in our Free Guitar Lessons.
For the fretting hand, the index finger is 1, the middle finger is 2, the ring finger is 3 and the pinky is 4.
The thumb is normally not part of the 1–4 guitar finger numbering system. In some chord diagrams, exercises or techniques, the thumb may be indicated separately with the letter T.
Yes. The numbering stays exactly the same. Finger 1 is still the index finger and finger 4 is still the pinky. The only difference is that a left-handed guitarist normally uses the right hand as the fretting hand.
No. Numbers written directly on the TAB strings normally indicate which fret to play. Finger numbers indicate which finger to use and are usually shown separately from the TAB fret numbers.
No. Suggested fingerings are usually chosen because they make a passage easier or more efficient, but different hand positions, techniques and musical contexts can require different fingerings. The best fingering is one that lets you play the passage comfortably, consistently and with good control.

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