Fig. 1 ·
The Online Tuner
♭ Flat
In tune
Sharp ♯
READY
A4 440 HZ
Strings · tap to hear
Start
A4 440

Press start and allow the microphone · nothing is recorded · or tap a string to tune by ear

Fig. 2 · Headstock · tap a note to hear it

While you play, an arrow on the peg shows which way to turn it. Machine heads vary, so if the note moves the wrong way, turn the other way.

Bass tuner online

Tune your 4, 5 or 6-string bass guitar with your microphone. The tuner is optimised for low notes, down to a low B.

Standard 4-string bass tuning is E A D G, the same notes as the bottom four guitar strings, one octave lower.

Also called · EADG

§ 1

String chart

String 1 is the thinnest. Frequencies are exact at A4 = 440 Hz; change the reference on the A4 knob.
StrNoteFrequency
1GG2 · Sol98.00 Hz
2DD2 · Re73.42 Hz
3AA1 · La55.00 Hz
4EE1 · Mi41.20 Hz
§ 2

Tuning your bass

Automatically with the microphone, or by ear: tap any note on the headstock to hear a real recorded reference.
  1. 1

    Allow microphone access. For the most accurate reading, play close to the microphone and pluck firmly.

  2. 2

    Play one string and let it sustain. Low notes take a moment longer to read, so hold the note.

  3. 3

    Tighten the string if you're flat (needle left), loosen it if you're sharp (needle right).

  4. 4

    Tip: the 12th-fret harmonic is an octave higher and often gives a steadier reading on the lowest strings.

§ 3

Bass tunings

9 tunings, all free. Notes listed from the lowest string.
§ 4

Questions & troubleshooting

What are the notes of bass strings?
A standard 4-string bass is tuned E A D G, from the thickest string to the thinnest. That's one octave below the bottom four strings of a guitar.
Why is my low E or B string hard to tune?
Laptop and phone microphones pick up very low frequencies weakly. Play closer to the microphone, pluck firmly, or tune using the 12th-fret harmonic, which sounds an octave higher.
What frequencies are the bass strings?
At A4 = 440 Hz: E1 is 41.20 Hz, A1 is 55.00 Hz, D2 is 73.42 Hz and G2 is 98.00 Hz. A 5-string's low B0 is 30.87 Hz.
§ 5

The T-1 range

One tuner, set up for every instrument.