1. Lock in the open strings first
Low to high, a 4-string bass is E A D G (5-string adds a low B: B E A D G). A silly phrase can make the order stick, e.g. “Elephants And Ducks Grow.” Make up your own, the goofier it is, the more it sticks.
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Select a note to see it across the neck
Pick a root note below, or tap a fret, to see the 7 chords in that key
Pick a pattern below, then tap a fret (or a note) to anchor it there
A few ways players commonly learn the fretboard, roughly in the order it helps to learn them. These cover the first 12 frets, which is where most of the neck's note names start to repeat.
Low to high, a 4-string bass is E A D G (5-string adds a low B: B E A D G). A silly phrase can make the order stick, e.g. “Elephants And Ducks Grow.” Make up your own, the goofier it is, the more it sticks.
Notes cycle A B C D E F G and repeat. Each fret is one half step, except B→C and E→F, which are already only a half step apart with no sharp/flat between them (just like the piano has no black key there). Everywhere else, the note between two letters is that letter sharped (or the next letter flatted).
Single dots fall on the odd frets 3, 5, 7, and 9, skipping fret 11 since it sits right next to the double dot at 12 (the octave of the open string, marking where the whole pattern restarts). After that it just repeats one octave higher: add 12 to each earlier dot to get 15, 17, 19, and 21, then a double dot again at 24 (two octaves up). So really there are only five dot positions to remember, 3, 5, 7, 9, 12, since every dot past the 12th fret is just one of those plus 12.
Learn the notes sitting on the inlay dots (frets 3, 5, 7, 9, and the double dot at 12, which is always the open string's note one octave up) before worrying about every fret in between. Once those anchors are solid, the frets around them are just a couple of half steps away.
Approach adapted from BassBuzz's fretboard guide — watch the video.
Same trick as remembering the open strings, one phrase per dotted fret, first letters read low string to high string (E A D G). Fret 12 is just the open strings again (an octave up), so it reuses the phrase from tip 1.
The phrase only gives you the letter, so keep the sharps in mind separately: fret 3's last note is sharped (A♯), and fret 9's first two notes are as well (C♯ and F♯). On a 5-string bass, the low B string follows the same pattern, one word further down the alphabet at each fret (fret 5 on B, for instance, lands on E, so the phrase becomes “Elephants... Angry Dogs Guard Chickens”).
Bass strings are tuned in fourths, so the note at the 5th fret of any string is the same note as the next open string up. Fret 5 on the E string is A, matching the open A string; fret 5 on the A string is D, matching the open D string, and so on. It's how you tune a bass by ear, and it's a fast way to carry a note you already know onto a string you don't.
Approach adapted from BassBuzz's fretboard guide — watch the video.
From any note, skip one string toward the G string and move up two frets, and you land on the same note name an octave higher. For example, C at fret 3 on the A string is also C at fret 5 on the D string... skip one more string and two more frets and it's C again at fret 7 on the G string. This shape is the same everywhere on the neck, so once you know it you can find any note's octave without counting frets from scratch.
Rather than trying to learn the whole neck at once, pick a single string and name each fret going up using the alphabet from tip 2. Once a string feels automatic, move to the next one, then start connecting strings with the 5th-fret rule and octave shape above.
Use the Note Map to check your work: pick a note, guess every place it should show up using the tricks above, then reveal the map and see how you did. Once notes start clicking, the fastest way to make them permanent is to use them in an actual scale, riff, or song rather than drilling names in isolation.