Ukulele Tuner
Tune your ukulele two ways: let the microphone read each string with a live needle and cents readout, or tune by ear with clean reference tones. Standard gCEA, Low G, Baritone and D-tuning — free, in your browser.
Tuning
Strings
Tap a string to hear its reference tone — no microphone needed.
Microphone tuner
Your microphone is analysed on your device only — nothing is uploaded, saved or recorded.
How the Ukulele Tuner works
This online ukulele tuner works two ways. Press Start microphone, pluck a string, and it detects the pitch on your device, showing the nearest note in big type with a needle that swings toward sharp or flat; centre the needle and the note turns green when you are within a few cents. Prefer to tune by ear? Tap any string button to play a clean reference tone and match it — no microphone required. Choose Standard gCEA, Low G, Baritone or the older D-tuning and the four target strings update for both methods. Everything runs client-side with the Web Audio API, so nothing is installed and, importantly, your microphone audio is never uploaded or recorded. Playing a guitar too? Try the Guitar Tuner, keep time with the Metronome, or explore more Music Tools.
Open string frequencies
Standard ukulele tuning is re-entrant: the 4th string is tuned HIGHER than the 3rd, so the strings do not run low-to-high across the neck. All frequencies are equal temperament referenced to A4 = 440 Hz.
| String | Note | Frequency | MIDI |
|---|---|---|---|
| 4th (g) | G4 | 392.00 Hz | 67 |
| 3rd (C) | C4 | 261.63 Hz | 60 |
| 2nd (E) | E4 | 329.63 Hz | 64 |
| 1st (A) | A4 | 440.00 Hz | 69 |
Because the g string (392.00 Hz) sits above the C string (261.63 Hz), a ukulele has no true bass string — this is what gives it its bright, chiming sound, and it is why beginners often think the 4th string is tuned an octave wrong.
Alternate tunings this tuner supports
| Tuning | Strings (as tuned) | Lowest pitch |
|---|---|---|
| Low G | G3 C4 E4 A4 | 196.00 Hz |
| Baritone (DGBE) | D3 G3 B3 E4 | 146.83 Hz |
| D-tuning (aDF#B) | A4 D4 F♯4 B4 | 293.66 Hz |
Why does my g string read higher than the C string?
A g string reading higher than the C string is correct, and it is the defining feature of standard ukulele tuning. Standard gCEA is re-entrant, meaning the 4th string is tuned up to G4 at 392.00 Hz rather than down below the C string at 261.63 Hz. The strings therefore do not run low to high across the neck, and the ukulele has no true bass string. This is what produces its bright, chiming sound. If you would rather the strings ran in pitch order, select the Low G tuning, which drops that string to G3 at 196.00 Hz.
Frequently Asked Questions
How do I tune my ukulele with the microphone?
Pick a tuning (Standard gCEA is the default), press Start microphone and allow your browser to use the mic, then pluck one string at a time. The tuner finds the pitch, shows the nearest note in large type, and swings a needle left or right. Turn the tuning peg until the needle sits at the centre and the note turns green — that means you are within a few cents of being in tune. It highlights which string you are closest to, so you can work through all four.
What is standard ukulele tuning?
Standard tuning for soprano, concert and tenor ukuleles is gCEA — the strings are G4, C4, E4 and A4. It is re-entrant, meaning the top G string is tuned high rather than being the lowest note. A baritone ukulele is tuned DGBE (D3, G3, B3, E4), the same as the top four strings of a guitar. This tuner includes gCEA, Low G, Baritone and an older D-tuning.
Can I tune my ukulele without a microphone?
Yes — you can tune a ukulele by ear. Tap any string button to hear that exact pitch — for example the A string at 440 Hz — and match your string to the tone by ear. This needs no microphone and no permission, so it works on any device, and it is handy in noisy rooms where microphone detection struggles.
Is my microphone audio uploaded or recorded?
No — the ukulele tuner analyses the microphone stream live on your device with the Web Audio API and never uploads, saves or records it. All pitch detection happens inside the page, so no audio and no tuning data leaves your browser. Pressing Stop, or closing the tab, releases the microphone at once.
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