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.
Microphone tuner
Play a string, see exactly how far off it is
- Your browser asks once for the microphone. Choose Allow.
- Audio is analysed on this device. Nothing is recorded or uploaded.
- The screen stays awake while the tuner runs.
Space start or stop 1 to 4 pick a string and hear it Esc stop the tone
| String | Note | Frequency (Hz) |
|---|---|---|
| 4th string (Low E) | E1 | 41.20 |
| 3rd string (A) | A1 | 55.00 |
| 2nd string (D) | D2 | 73.42 |
| 1st string (G) | G2 | 98.00 |
Values use equal temperament with A4 fixed at 440 Hz. Every frequency links to its own reference page. The tuner above rescales them when you calibrate A4.
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.
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Frequencies on this page are computed at build time from twelve tone equal temperament with A4 = 440 Hz, using the twelfth root of two (about 1.059463) per semitone. Nothing is typed in by hand. See the full method and sources. Maintained by FusionStudios. Last reviewed: .