Online Bass & Ukulele Tuner — Bass, Ukulele & Baritone on One Page
Reference tone tuner for three instruments on one page — 4-string bass guitar (E A D G), standard ukulele (G C E A) and baritone ukulele (D G B E). Click any string button to hear its exact target pitch and tune by ear. Furthermore, no microphone is required. The A4 reference pitch adjusts from 430 to 450 Hz. String frequencies in exact Hz appear for every instrument.
How to use the Online Bass & Ukulele Tuner
Select your instrument
Click Bass Guitar, Ukulele or Baritone Ukulele at the top. Furthermore, the string layout and frequencies update instantly for the selected instrument. Each instrument uses a different colour scheme for easy visual identification.
Click a string button to hear the reference tone
Each button shows the string name, note and exact frequency. Furthermore, clicking it plays a sustained tone at that exact pitch. Pluck your string and adjust the tuning peg until the pitch matches the reference tone you hear.
Tune from below — approach the target upward
Always tune a string up to its target pitch rather than down. Furthermore, this keeps tension consistent and the string stable during playing. If your string is above the target, tune it down past the note and then back up to it.
Adjust A4 reference if needed
The standard A4 reference is 440 Hz. Furthermore, slide the A4 control if you need to match a different instrument or ensemble tuning standard. All string frequencies shift proportionally when you change A4.
Check the frequency table for precise values
The table below the strings shows exact Hz values for every string. Furthermore, these precise values are useful for comparing string frequencies across instruments, setting up software synthesisers and understanding the relationship between bass and guitar tunings.
Comparing bass, ukulele and baritone tunings
The three instruments share a common musical relationship. Furthermore, the baritone ukulele uses the same four notes as guitar strings 4 through 1 — D G B E — making it a natural transition instrument for guitarists. The table shows how the three tunings compare.
| String | Bass guitar (Hz) | Ukulele (Hz) | Baritone uke (Hz) |
|---|---|---|---|
| 4 (lowest) | E2 — 41.20 Hz | G4 — 392.00 Hz (re-entrant) | D3 — 146.83 Hz |
| 3 | A2 — 55.00 Hz | C4 — 261.63 Hz | G3 — 196.00 Hz |
| 2 | D3 — 146.83 Hz | E4 — 329.63 Hz | B3 — 246.94 Hz |
| 1 (highest) | G3 — 196.00 Hz | A4 — 440.00 Hz | E4 — 329.63 Hz |
What is re-entrant ukulele tuning?
Standard ukulele tuning is re-entrant — the 4th string (G) is tuned higher than the 3rd string (C). Furthermore, this creates the characteristic "high G" sound that defines the ukulele's bright, cheerful tone. Moreover, the re-entrant tuning means the strings do not run from low to high like a guitar — the G string sits above the C string in pitch, giving ukulele music a unique chord voicing not possible on guitar.
Bass and ukulele frequency relationships
The bass guitar sits two octaves below standard guitar in most string positions. Furthermore, an octave relationship means the higher string vibrates exactly twice as fast as the lower string. The bass G string (G3, 196 Hz) is exactly one octave below the ukulele's C string in a different register.
Ukulele A4 (MIDI 69) = 440 × 2^((69−69)/12) = 440.00 Hz
Baritone E4 (MIDI 64) = 440 × 2^((64−69)/12) = 329.63 Hz
One octave up = frequency × 2
Worked example: tuning a ukulele from scratch
A ukulele bought in a music shop arrives detuned. Using the reference tone tuner:
| Step | String | Target | Action |
|---|---|---|---|
| 1 | 4 - G (high G) | 392.00 Hz | Click G button, tune up to match |
| 2 | 3 - C | 261.63 Hz | Click C button, tune up to match |
| 3 | 2 - E | 329.63 Hz | Click E button, tune up to match |
| 4 | 1 - A | 440.00 Hz | Click A button, tune up to match |
| 5 | All strings | Strum chord | Strum all open — should sound like C major |
Bass guitar, ukulele and baritone ukulele
The bass guitar is the rhythmic and harmonic foundation of most band arrangements. Furthermore, its four strings (E A D G) sit two octaves below the equivalent guitar strings. The bass locks with the kick drum to create the groove of any ensemble. Moreover, precise tuning is essential — bass notes sustain longer than guitar notes, making intonation errors more noticeable.
The ukulele produces one of the most recognisable sounds in popular music. Furthermore, its four nylon strings in re-entrant G C E A tuning create a warm, bright timbre suited to folk, pop, Hawaiian music and jazz. The baritone ukulele uses a larger body and lower tuning (D G B E) — the same as the top four guitar strings. Moreover, this makes it an ideal bridge instrument for guitarists transitioning to the ukulele family.
Why bass tuning accuracy matters more than guitar
Low frequencies are harder to hear as sharp or flat than high frequencies. Furthermore, an out-of-tune bass note at 41 Hz is difficult to detect by ear alone — the reference tone method provides an objective pitch target. Moreover, live sound engineers and recording producers are trained to hear bass intonation issues that casual listeners miss. Accurate bass tuning prevents phase cancellation between the bass and kick drum in live and studio mixes.
Why a dedicated multi-instrument tuner matters
Most online tuners focus on guitar only. Furthermore, bass players and ukulele players must either use a guitar tuner and mentally transpose, or find separate dedicated tools. This LazyTools tuner covers all three instruments on one page — eliminating the need to switch between multiple tools during a session. Moreover, the exact Hz values shown for every string make this tool useful for software tuning and acoustic analysis beyond simple instrument setup.
The ukulele has grown dramatically in popularity over the past decade. Furthermore, it ranks among the fastest-growing instruments by sales in the US, UK and Australia. Its approachable size and low price point attract beginners, children and adults returning to music. Moreover, baritone ukulele has found a specific niche among fingerstyle players who want the nylon-string feel with a guitar-compatible tuning.
Bass intonation in recording sessions
Session bassists tune their instrument multiple times during a recording session. Furthermore, temperature changes in studios affect string tension — a well-tuned bass at the start of a take can drift noticeably by the end. Recording engineers typically ask bassists to retune between every three or four takes. Moreover, direct input (DI) recording captures bass with greater fidelity than microphones — making intonation errors more apparent in the final mix.
Frequently asked questions
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