ToneLab Studio

Online Chromatic & Instrument Tuner

Select an instrument preset below to tune with your microphone or click any string button to hear a reference tone.

--

0.0 Hz 0 cents

-50c (Flat) In Tune +50c (Sharp)

Microphone audio is processed locally by our audio tools. We do not intentionally upload or store recordings. Advertising providers may process other usage data as described in our Privacy Policy.

Standard String Frequencies (A4 = 440 Hz)

Instrument	Open Strings (Low to High)	Target Frequencies (Hz)
6-String Guitar	E2 – A2 – D3 – G3 – B3 – E4	82.41 – 110.00 – 146.83 – 196.00 – 246.94 – 329.63
4-String Bass	E1 – A1 – D2 – G2	41.20 – 55.00 – 73.42 – 98.00
Ukulele (Standard)	G4 – C4 – E4 – A4	392.00 – 261.63 – 329.63 – 440.00
Violin	G3 – D4 – A4 – E5	196.00 – 293.66 – 440.00 – 659.25
Cello	C2 – G2 – D3 – A3	65.41 – 98.00 – 146.83 – 220.00