How to Tune a 4-String Bass | Step-By-Step

Standard 4-string bass tuning is E–A–D–G, from the lowest string to the highest, with each string tuned a perfect fourth above the one before it.

Getting a bass in tune is the first thing every player learns, and it never stops mattering. The standard setup across almost all bass instruction in the US is E–A–D–G, from the thickest (lowest) string to the thinnest (highest). Those open strings sit one octave below the same notes on a guitar, which is why a bass and a guitar can play the same names but sound very different. If the instrument sounds “off” even after tuning, this octave difference is usually the reason.

What Notes Are the Four Bass Strings?

From lowest to highest, the strings are E, A, D, and G. In scientific pitch notation those are E1, A1, D2, and G2, and their open-string frequencies are E1 at 41.20 Hz, A1 at 55.00 Hz, D2 at 73.42 Hz, and G2 at 98.00 Hz, based on the standard reference pitch of A4 = 440 Hz.

That layout matters because it answers a common beginner question: is a bass tuned like a guitar? The note names are the same as the guitar’s top four strings, but a bass is tuned one full octave lower. A 4-string bass and a standard guitar share the E–A–D–G pattern in name only.

Tuning by Ear With the 5th-Fret Method

The most reliable no-tuner method uses the A string as the reference point, then matches each neighbor string to it. It works because the 5th fret of a lower string plays the same pitch as the next open string above it. Here is the sequence:

• Get the A string to a known A1 pitch, using a piano, a tuner app, or any reliable reference.
• Press the 5th fret on the E string and tune the E string until that fretted note matches the open A string.
• Press the 5th fret on the A string and tune the D string until that fretted note matches the open D string.
• Press the 5th fret on the D string and tune the G string until that fretted note matches the open G string.

After setting all four strings, go back and re-check the whole set. Adjusting one string can nudge the others slightly out of tune, so a final pass is part of the method, not an optional extra. If you are shopping for a clip-on or pedal tuner, our tested roundup of the best 4-string bass guitar tuners covers the options that read low bass frequencies reliably.

Using an Electronic Tuner on a Bass

A digital tuner makes the job faster, but only if it can hear low notes. Many general-purpose tuners struggle with the E1 at 41.20 Hz, so check that the device supports low-frequency instruments or has a chromatic mode before you rely on it. Clip-on tuners using vibration sensors typically handle bass better than budget microphone-based models in a noisy room.

One practical tip from experienced players: when a string reads slightly flat, tune it up to pitch rather than down to it. Approaching the note from below helps the strings settle into a stable reading. This is field knowledge rather than official documentation, but it is a habit worth keeping.

Alternate Tunings Worth Knowing

Standard E–A–D–G is the default for most bass lessons, tabs, and charts, but it is not the only option. Drop D lowers the E string a whole step to D for a heavier low end. DADG lowers the top three strings to match, and BEAD shifts the entire set down for extended-range playing. These appear regularly in rock and metal, so the trade is real: learn standard tuning first and treat alternates as deliberate variations rather than replacements.

The tuning reference on StudyBass, a long-running resource for bass players, walks through both the standard sequence and the alternate setups in more depth. The Wikipedia bass guitar tuning entry documents the same pitch scheme, open-string frequencies, and alternate systems used across the instrument’s history.

For most players, most days, E–A–D–G is the whole job. A reliable reference, the 5th-fret method, and one final check will keep a 4-string bass sounding the way it was designed to.