Here is a free online mandolin tuner that allows you to tune any musical instrument in the mandolin family. Remember the mandolin is tuned GDAE, but there are other instruments (mandola, octave, mandocello etc.) with different tunings.

With this mandolin tuner you can:

  • Tune with a microphone (easier), by letting the online mandolin tuner use your computer’s mic to “hear” your mandolin’s sound and then tell you if you need to loosen or tighten the string using the tuning peg, or
  • Tune by ear (in case your mic is not working or your browser does not support flash), by pressing the corresponding vertical buttons to hear the note and then use the corresponding tuning peg to match your mandolin’s string sound to it

Online Mandolin Tuner

Mandolin Tuning with a mic

  1. Press “Click to use flash” displayed in a small grey button at the middle of the tool, and then “Allow” at any other notification displayed.
  2. Click on the vertical Instrument selection box .
  3. Select the instrument you are tuning.
  4. Pluck the string you are tuning, and tighten or loose the corresponding tuning peg until the indication is correct

Mandolin Tuning by Ear

  • Press the button (G, D, A, E) to hear the reference sound
  • Use your ear to identify if the sound of your mandolin string matches the sound you hear
  • If there is no match, you need to use a tuning peg to tighten or loose your string till you have a match
  • Repeat for all mandolin strings

Tuning How-To (more details)

I usually start with the G string pair (thickest), and continue with the other pairs (D, A, E) till the mandolin is fully tuned:

  • Identify the G strings and G tuning pegs using the image below.
  • Pick one of the G strings of the pair, and see if the online mandolin tuner shows your are in-tuned.
  • Tighten or loosen the corresponding G tuning peg, till you have a match.
  • Repeat for both strings of each pair (G, D, A, E)

Note: If you turn one tuning peg of the pair and the sound does not change, stop turning to avoid breaking the string. You are possibly turning the wrong peg. Please try the other peg of the pair!

mandolin head

Alternative Digital Tuners

You may also want to try the digital tuners below:


D’Addario NS Micro Clip-On Tuner

  • Highly precise clip-on tuner for a wide range of instruments including guitar, bass, ukulele, banjo, mandolin, and more
  • Discrete, highly compact design hides behind the headstock and is small enough to leave on every instrument you own – get one for each case
  • Extremely accurate chromatic tuning based on vibration, no sound or cable input required
  • Adjustable ratchet mechanism and reversible screen allows for placement on front or back of headstock
  • Visual metronome feature for additional practice aid
Snark SN-8 Super Tight All Instrument Tuner- Musical Instruments


  • Snark SN-8 Super Tight Tuner
  • Super Tight Tuning
  • Faster Brighter EZ Read Display
  • Display Rotates 360 degrees.
  • Tap Tempo Metronome.
  • Includes ChromaCast Guitar Pick Sampler.


Τhis Cherub WMT-555C is a versatile little equipment, as it is:

    • a mic-based tuner
    • a tuner that senses the vibrations of the instrumentvia the clip-on pickup
    • a metronome that supports a great variety of tempos and note values
    • a silent metronome realised via the included earphone
    • a multi-instrument tuner with the supported tuning setting

More Mandolin Tuning Articles

If you have reached here, it probably means you have tuned your mandolin! I am so happy for you! Thank you so much for spending your time trying my online mandolin tuner and instructions.

Please leave me a message to inform me how much time it took you to tune your mandolin.

If you did not manage to tune it, also leave me a message describing your experience, and also check other posts below: