Bass tool

Free online Bass Tuner for four-string electric bass

Tune E A D G, Drop D, half-step down, and full-step down bass setups in your browser. Use the microphone for live pitch feedback, then tap each string for a real electric bass reference note.

Click to start recording

0.00 Hz

Target Frequency: 41.2 Hz

Bass tunings

Choose the bass tuning you need

Start with standard four-string bass tuning, then switch when the song needs a lower D or an all-strings-down setup.

Standard Bass Tuning

E A D G

Standard bass tuning uses E A D G from low to high and is the default setup for most four-string electric bass lines, lessons, tabs, and band arrangements.

Drop D Bass Tuning

D A D G

Drop D bass tuning lowers the fourth string from E to D for deeper low notes and easy octave shapes while leaving the top three strings in standard tuning.

Half Step Down Bass Tuning

Eb Ab Db Gb

Half step down bass tuning lowers every string one semitone for a darker pitch center while preserving standard interval relationships.

Full Step Down Bass Tuning

D G C F

Full step down bass tuning lowers every string a whole step for heavier songs while keeping the same string-to-string intervals as standard tuning.

Standard setup

Need the standard setup itself? Open the E A D G bass tuning guide

Standard bass tuning uses E A D G from low to high. This hub is for quick tuning, and the dedicated standard page keeps the note order and target pitches in one place.

Open standard bass tuning

Tuning notes

Standard bass tuning notes are E A D G

These are the open-string targets from lowest to highest on a four-string electric bass.

E string

Lowest standard bass string. Let it ring clearly and give the meter time to settle on the fundamental or its octave.

A string

Second-lowest string. Use it as a stable middle reference if the low E is hard to read in a noisy room.

D string

Middle-high string. Tune slowly because small peg movements can shift the pitch more than expected.

G string

Highest standard bass string. Recheck it after changing the lower strings because neck tension can move slightly.

Low-end tracking

Bass notes can trigger octave readings

Low strings often produce strong overtones, so the tuner compares octave-related candidates against the selected target. This keeps E1 and D1 from jumping to the wrong string when the microphone hears a harmonic more clearly than the fundamental.

Reference tone

Reference notes use electric bass samples

The string buttons play electric bass samples from the bass-electric library, then pitch the nearest sample only as much as needed for the target note.

Quick Bass Tuner questions

Use these before you chase an octave reading or switch to a lower tuning.

Is this Bass Tuner for four-string bass?

Yes. This Bass Tuner is built for common four-string electric bass tunings: standard, Drop D, half-step down, and full-step down. Choose the mode that matches your song, then tune one open string at a time.

Why does a bass tuner sometimes show the octave instead of the low note?

Bass fundamentals are low and can be quieter than their overtones on small speakers or built-in microphones. This tuner checks octave-related candidates against the target string so a clear overtone can still guide the correct low-string tuning.

Are the reference notes real bass sounds?

Yes. The reference buttons use electric bass samples from tonejs-instruments. The samples are hosted from the site CDN and are not generated from a plain sine wave.

Pitch Detector

Check any sustained bass note when you want open-ended pitch feedback instead of a fixed string target.

Online Metronome

Practice locked bass lines after the tuning is stable.

Electric bass reference samples are from tonejs-instruments and credited to Karoryfer under CC BY 3.0.