Free Bass Tuner Online
Tune your 4-string bass guitar online for free. Our bass tuner uses real-time pitch detection optimized for low frequencies.
4-String Bass String Reference
Standard (EADG) tuning frequencies:
| String | Note | Octave | Frequency |
|---|---|---|---|
| 4 | E | 1 | 41.20 Hz |
| 3 | A | 1 | 55.00 Hz |
| 2 | D | 2 | 73.42 Hz |
| 1 | G | 2 | 98.00 Hz |
How to Tune Your 4-String Bass
Standard 4-string bass tuning from low to high is E A D G, one octave below the guitar's four lowest strings. The E string vibrates at 41.2 Hz.
- 1Click 'Start Tuning' and allow microphone access
- 2Pluck the 4th string (thickest) - it should be E (41.2 Hz)
- 3Play each note clearly and let it ring - bass frequencies need more time to analyze
- 4Tune the 3rd string to A (55 Hz)
- 5Tune the 2nd string to D (73.42 Hz)
- 6Tune the 1st string to G (98 Hz)
- 7Double-check all strings after tuning
Frequently Asked Questions
Standard 4-string bass tuning is E A D G, from lowest to highest. These are the same notes as the guitar's four lowest strings but one octave lower. E1 = 41.2 Hz, A1 = 55 Hz, D2 = 73.42 Hz, G2 = 98 Hz.
Bass strings need clear, sustained notes for accurate detection. Pluck near the bridge for a brighter tone that's easier to detect. Let each note ring for 2-3 seconds. If detection is inconsistent, try plucking harder.
Drop D bass tuning lowers the E string to D (36.71 Hz). This gives you a lower range and makes certain patterns easier. It's common in rock and metal where guitars also use Drop D.
Tune from the thickest string (E) to the thinnest (G). After tuning all strings, check them again - bass neck tension changes as you tune, which can affect other strings.