Tuner

Play a string and the needle tells you whether it is flat, sharp or in tune. If the microphone is not available, sound each string here and tune by ear.

Instrument
Note names
Reference A
–
−50+500
–

Press Listen and play a string.

Strings

Tap a string to hear its note. Tap again to stop.

The octave numbers

The small number under the note name is its octave. The numbers follow the keys of a piano and go up by one at every C: the B just below middle C is B3, and middle C is C4. A piano runs from A0 to C8.

C3C4middle CA4440 HzC5

Reference A is A4, the A above middle C, at 440 Hz. Each octave up doubles the number and each octave down halves it: A5 is 880 Hz and A3 is 220 Hz.

A half step is 100 cents, so the in-tune zone of five cents is a twentieth of a half step. Tap a key to hear it.

Standard tunings

The frequencies with A at 440 Hz, lowest string to highest.

InstrumentStringsHz
GuitarE2 · A2 · D3 · G3 · B3 · E482.4 · 110.0 · 146.8 · 196.0 · 246.9 · 329.6
BassE1 · A1 · D2 · G241.2 · 55.0 · 73.4 · 98.0
UkuleleG4 · C4 · E4 · A4392.0 · 261.6 · 329.6 · 440.0
MandolinG3 · D4 · A4 · E5196.0 · 293.7 · 440.0 · 659.3
CharangoG4 · C5 · E4 · E5 · A4 · E5392.0 · 523.3 · 329.6 · 659.3 · 440.0 · 659.3
ViolinG3 · D4 · A4 · E5196.0 · 293.7 · 440.0 · 659.3

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