Piano Tuner
Free online piano tuner with 6 tuning presets. Tune your piano using your microphone with accurate pitch detection.
Piano Tunings
Choose from 6 popular piano tuning standards. Each tuning page includes a pre-configured tuner and information about when to use it.
How to Tune a Piano
Tuning your piano is essential for producing beautiful music. A standard piano has 88 keys spanning over seven octaves, from A0 (27.5 Hz) to C8 (4186 Hz). The standard reference pitch is A4 = 440 Hz, which is the universal concert pitch used worldwide.
Piano tuning uses equal temperament, where each octave is divided into 12 equally spaced semitones. Begin by tuning the A4 key to 440 Hz, then use this reference to tune the surrounding notes. A tuning lever is used to turn the tuning pins, adjusting the tension of each string to achieve the correct pitch.
How to Use This Piano Tuner
- Select your tuning standard from the dropdown menu (Standard A440 is selected by default).
- Click the microphone button and allow microphone access when prompted.
- Play a single note on your piano. The tuner will automatically detect the pitch.
- You can also tap a specific note button to tune to that note. The tuner will show how sharp or flat you are from the target pitch.
- Turn the tuning pin with a tuning lever until the indicator is centered and the status shows "In Tune."
- Repeat for each note until your piano is fully in tune.
Understanding Piano Tuning Standards
Standard A440 — The international standard tuning with A4 set to 440 Hz. This is the universal reference pitch used by virtually all modern pianos, orchestras, and instruments worldwide.
Baroque A415 — Historical baroque pitch with A4 at 415 Hz, approximately a half step below modern concert pitch. Used for historically informed performances of Bach, Handel, and other baroque composers.
Concert A442 — Slightly higher than standard, with A4 at 442 Hz. Commonly used by European orchestras, particularly in Germany and Austria, for a brighter, more brilliant tone quality.