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Bass Tuner
Press Start, hold the bass close to the microphone (or play through an amp) and pluck an open string firmly. Low strings are quiet on laptop and phone mics, so let the note ring and give the tuner a second to settle.
Sound is analysed on your device; nothing is recorded or uploaded.
Target · Waiting for a note
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Press Start and allow the microphone.
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Tap a string to hear its note and tune only that string. Switch back to Auto to let the tuner pick the string.
Pitch trace (centre line = in tune, ±50 cents)
Bass tunings
Every tuning the tuner knows, lowest string first, with each string’s frequency at A4 = 440 Hz.
| Tuning | Notes | Frequencies (Hz) |
|---|---|---|
| 4-string standard (E A D G) | E1 A1 D2 G2 | 41.20 · 55.00 · 73.42 · 98.00 |
| 5-string (B E A D G) | B0 E1 A1 D2 G2 | 30.87 · 41.20 · 55.00 · 73.42 · 98.00 |
| Drop D (D A D G) | D1 A1 D2 G2 | 36.71 · 55.00 · 73.42 · 98.00 |
| Half step down (E♭ A♭ D♭ G♭) | E♭1 A♭1 D♭2 G♭2 | 38.89 · 51.91 · 69.30 · 92.50 |
More tuners
Guitar tunings
Practising after tuning? Keep time with the online metronome.
About the Bass Tuner
Press Start, hold the bass close to the microphone (or play through an amp) and pluck an open string firmly. Low strings are quiet on laptop and phone mics, so let the note ring and give the tuner a second to settle.
How to use it
- 1 Press Start tuner and allow the microphone.
- 2 Pick your tuning, or keep Standard (E A D G B E).
- 3 Pluck one open string and let it ring: the tuner shows the string and a needle.
- 4 Tighten the string if it says tune up, loosen it if it says tune down, until the needle sits in the green and the string gets a tick.
Frequently asked questions
What are the bass guitar string notes?
A 4-string bass is tuned E1, A1, D2 and G2, from the thickest string: the same notes as the lowest four strings of a guitar, one octave lower. A 5-string bass adds a low B0 below the E.
Why doesn’t the tuner pick up my low E or B?
Low notes are hard for small built-in microphones. Hold the bass body against the laptop or phone, pluck harder, or use a harmonic: the 12th-fret harmonic of each string is an octave higher and easier to detect, and gives the same tuning.
Can I tune a bass with a guitar tuner?
Yes. Pick the Bass page so the tuner looks for the right octave and string names. In chromatic mode any tuner will show E, A, D and G for the open strings.
Is my audio recorded or uploaded?
No. The tuner analyses the sound from your microphone in your browser, a few times a second, and throws it away. Nothing is recorded, saved or sent to a server.
Why does the tuner jump between notes?
Usually because more than one string is ringing, the room is noisy, or the note has faded. Mute the other strings with your fretting hand, pluck firmly, and read the needle while the note is still strong. Moving closer to the microphone helps on laptops.
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