Note Frequency Calculator and String Tuning Chart
Find the frequency in Hz of any note from C0 to B8 at A4 = 440 Hz or a custom reference, and see the open-string notes for guitar, bass, ukulele, violin, cello and more.
Standard open-string tunings
Strings are listed from lowest to highest pitch except the ukulele and banjo, which use a re-entrant tuning with one high string on the outside. Frequencies follow the A4 reference above.
| Instrument | Open strings |
|---|
How it works
Equal temperament splits the octave into 12 equal steps, so each semitone multiplies the frequency by the twelfth root of 2. The formula is frequency = A4 × 2^((n − 69) ÷ 12), where n is the MIDI note number and A4 is note 69. Most clip-on tuners let you change the A4 reference between about 430 and 450 Hz.
Related buying guides
- Guitar Tuners 60 guides
- Acoustic Guitars 55 guides
- Electric Guitars 48 guides
- Classical Guitars 17 guides
- Bass Guitars 33 guides
- Ukuleles 48 guides
- Violins 17 guides
- Violas 2 guides
- Cellos 7 guides
- Banjos 24 guides
- Mandolins 14 guides
- Guitar Strings 46 guides
- Ukulele Strings 8 guides
- Electric Violins 14 guides