Guitar Fretboard Notes, Explained From Zero

The short answer: music uses 12 notes that repeat forever: A, A♯/B♭, B, C, C♯/D♭, D, D♯/E♭, E, F, F♯/G♭, G, G♯/A♭ — then back to A. Each guitar string starts on its open note and walks through this cycle one fret at a time. That's the entire fretboard.

The 12-note alphabet

Seven natural notes (A B C D E F G) plus five in-between notes (the sharps/flats). Each string starts the cycle from its open note — shaky on which string is which? String names first. Two rules cover everything:

1. Each fret = one semitone. Moving up one fret always moves you one step through the 12-note cycle.
2. E–F and B–C have no note between them. Everywhere else, natural notes have a sharp/flat between them. (Why? See why there's no E♯ or B♯.)

The full map, one string at a time

Here's the low E string with every note, not just naturals:

The faint labels show how every position has a name. A few observations that make this less overwhelming:

• Fret 12 = the open note, one octave up. The whole map repeats after that (here's why).
• A♯ and B♭ are the same fret. Which name you use depends on musical context — in the key of F you'd call it B♭, in the key of B you'd call it A♯. Same pitch, different jobs.
• The dots (3, 5, 7, 9, 12) are your landmarks. On the low E string they're G, A, B, C♯, E. On the A string: C, D, E, F♯, A. (What the dots mean.)

Don't memorize 72 positions — memorize the system

Six strings × 12 frets sounds like a flashcard nightmare, but the structure collapses it:

• Both E strings are identical → 5 unique strings
• Sharps/flats are derivable from naturals → ~7 notes per string
• Octave shapes derive the D and G strings from E and A → 3 strings to really learn

The step-by-step method (which strings first, how to drill, how long it takes) is in the main guide: How to memorize the guitar fretboard.