Bass Guitar Tuner
Tune a 4-string bass guitar to standard tuning EADG with a free mic tuner that shows note, Hz and cents for every string.
Values use equal temperament with A4 fixed at 440 Hz. Play one open string at a time and match it against the tuner below.
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Standard 4-string bass tuning is E1, A1, D2 and G2, an octave below the bottom four strings of a guitar. This page shows the exact target note and frequency for each string, then hands off to TuneStand's chromatic tuner for tuning by ear.
How to tune a bass guitar
The four strings are tuned in perfect fourths: E1 at 41.2 Hz, A1 at 55 Hz, D2 at 73.42 Hz and G2 at 98 Hz. These are the same letter names as the bottom four strings of a 6-string guitar, just one octave lower, which is why bass and guitar tuning share the same EADG pattern.
Low frequencies are harder for a microphone and pitch detector to lock onto cleanly, especially E1 near the bottom of the audible bass range. Play the string with a firm, sustained pluck, keep the room quiet, and give the reading a moment to settle before trusting the cents display.
Frequently asked questions
What is standard bass guitar tuning?
Standard 4-string bass tuning, low to high, is E1, A1, D2, G2. It matches the bottom four strings of a guitar, one full octave lower.
What frequency is the low E on a bass?
E1 is 41.2 Hz, a full octave below the low E on a 6-string guitar at 82.41 Hz. It is one of the lowest common pitches in popular music.
Why is the low string harder to tune by ear?
Very low frequencies have long wave periods, so a pitch detector needs more time and a cleaner signal to find the fundamental. Play the string firmly and wait a moment for the reading to stabilise.