Bass Tuner
Standard bass guitar tuning is E – A – D – G, from the thickest string to the thinnest. The notes are one octave lower than the four lowest guitar strings. Press Start tuner and play one string at a time.
Your browser will ask to use the microphone. Choose Allow.
✓ All strings in tune
Tap a string to hear it and tune only that string. Audio is analysed on this device and never uploaded. How it works →
- What it does
- Hears each bass string, shows which one, its note, Hz and cents
- What it does not do
- Record or upload audio · detect chords
- Reference pitch
- A4 = 440 Hz, adjustable 415–466 Hz
- Tested with
- 58 studio recordings of 11 instruments (right note on about 95% of frames at normal volume) and test tones from B0 to C6
- Made by
- The Appcellent team
- Updated
- November 2026
Tuner not hearing you?
- Allow the microphone. If you blocked it: in Chrome or Edge, click the icon left of the address bar → Microphone → Allow, then reload. In Safari on iPhone, tap aA → Website Settings → Microphone → Allow. In Firefox, click the crossed-out microphone in the address bar. On a Mac, also check System Settings → Privacy & Security → Microphone for your browser.
- Open the page in Safari or Chrome. In-app browsers (Instagram, Facebook, TikTok) often block the microphone.
- Play one note at a time, louder. Hold your phone or laptop close to the instrument and let the string ring. A quiet room helps.
- Low notes: phone and laptop microphones pick up low bass notes weakly. Pluck firmly, or play the 12th-fret harmonic.
- Wrong octave or jumping notes? Let the attack fade for a moment — the reading settles once the note is steady.
- No microphone at all? Tap a string button to hear its note and tune by ear.
Bass string notes and frequencies
Standard bass tuning is E1 (41.20 Hz), A1 (55.00 Hz), D2 (73.42 Hz) and G2 (98.00 Hz), from the lowest string to the highest (A4 = 440 Hz).
| String | Note | Frequency |
|---|---|---|
| 4 | E1 | 41.20 Hz |
| 3 | A1 | 55.00 Hz |
| 2 | D2 | 73.42 Hz |
| 1 | G2 | 98.00 Hz |
How to tune your bass
- Press Start tuner and allow the microphone. Put the device close to the bass amp or the bass body.
- Play the E string firmly and let it ring for a second.
- Turn the tuning key until the needle is centered and the note turns green.
- Tune A, D and G, then check all strings again.
5-string and 6-string bass tuning
A 5-string bass adds a low B: B – E – A – D – G. A 6-string bass adds a high C as well: B – E – A – D – G – C. The low B is about 30.87 Hz, very low for a phone microphone, so pick hard and let it ring. Choose the tuning in the menu above.
Tip: use the 12th-fret harmonic
Low bass notes have a weak fundamental that small microphones pick up poorly. Lightly touch the string over the 12th fret and pluck it: the harmonic is one octave higher and gives the tuner a cleaner signal. In standard tuning the tuner recognises the octave and still shows the right string; in other tunings, tap the string’s button first to lock the tuner to it.
Drop D (D A D G)
| String | Note | Frequency |
|---|---|---|
| 4 | D1 | 36.71 Hz |
| 3 | A1 | 55.00 Hz |
| 2 | D2 | 73.42 Hz |
| 1 | G2 | 98.00 Hz |
5-string (B E A D G)
| String | Note | Frequency |
|---|---|---|
| 5 | B0 | 30.87 Hz |
| 4 | E1 | 41.20 Hz |
| 3 | A1 | 55.00 Hz |
| 2 | D2 | 73.42 Hz |
| 1 | G2 | 98.00 Hz |
6-string (B E A D G C)
| String | Note | Frequency |
|---|---|---|
| 6 | B0 | 30.87 Hz |
| 5 | E1 | 41.20 Hz |
| 4 | A1 | 55.00 Hz |
| 3 | D2 | 73.42 Hz |
| 2 | G2 | 98.00 Hz |
| 1 | C3 | 130.81 Hz |
Half step down (E♭ A♭ D♭ G♭)
| String | Note | Frequency |
|---|---|---|
| 4 | E♭1 | 38.89 Hz |
| 3 | A♭1 | 51.91 Hz |
| 2 | D♭2 | 69.30 Hz |
| 1 | G♭2 | 92.50 Hz |