12NOTEZ · Free Tool

Online Mandolin Tuner

Tune your mandolin with your mic — Standard — G D A E (same as violin). Free, accurate, private.

Press Start and allow mic
♭ flat
sharp ♯
G
D
A
E

Your audio never leaves your device — detection runs entirely in your browser.

Add this tuner to your site — free

Music teachers, bloggers and band sites: paste this snippet to embed the tuner anywhere.

<iframe src="https://12notez.in/embed/tuner" width="100%" height="540" style="border:0;border-radius:12px;max-width:380px" title="Free Online Tuner by 12NOTEZ" loading="lazy"></iframe>

Mandolin tuning: Standard — G D A E (same as violin)

A mandolin is tuned G D A E — identical pitches to a violin — but in four pairs (courses) of doubled strings. Tune both strings of each pair to the same note so they ring cleanly together.

G3D4A4E5

How to tune a mandolin

  1. Allow mic access and play one string of the G pair — match G3.
  2. Tune its partner to the same pitch, then move through the D, A and E pairs.
  3. Doubled strings beat against each other when slightly off — tune until the wobble disappears.

Alternate mandolin tunings

TuningNotes
Open GG D G B — occasional folk/old-time tuning

Switch the instrument selector above to chromatic mode to tune to any of these notes by ear.

Frequently Asked Questions

What is standard mandolin tuning?

Standard mandolin tuning is Standard — G D A E (same as violin) — strings G3, D4, A4, E5 from lowest to highest.

How do you tune a mandolin?

Allow mic access and play one string of the G pair — match G3. Tune its partner to the same pitch, then move through the D, A and E pairs. Match each string to the needle until it reads in-tune (green).

What are the mandolin string notes?

From low to high, the strings are G3, D4, A4, E5.

Can I tune a mandolin with my phone mic?

Yes — this tuner uses your device microphone with cents-precise pitch detection, runs entirely in your browser, and your audio never leaves your device.

Tune another instrument

Prefer to set tempo instead? Try the free online metronome, or find any song's key in our database.