📊 NOTE FREQUENCY CHART
Every note. Every frequency.
C0 to B8 with exact Hz, MIDI number, and wavelength. Switch reference pitch (A = 432, 440, 442, or 444 Hz) to see how every note shifts. Tap any row to hear it.
🔍
A =
| Note | Octave | Frequency (Hz) | MIDI | Wavelength |
|---|
No matches. Try a note name (C4), frequency (440), or MIDI number (69).
Note: pitch class
Octave: scientific (middle C = C4)
MIDI: A4 = 69
Wavelength: at 343 m/s (air, 20°C)
How the numbers are calculated. Every note's
frequency follows
f = A × 2^((midi − 69) / 12),
where A is your chosen reference pitch (440 Hz by default).
MIDI number maps semitones from C-1 (= MIDI 0); A4 = 69.
Wavelength in air = 343 m/s ÷ f. The 432 Hz
tuning is a popular alternative (slightly below standard
pitch); 442/444 are common orchestral choices in continental
Europe. Tap the green ▶ button on any row to hear the tone
— useful for absolute-pitch reference or checking that your
tuner / DAW is calibrated. Guitar tuner
uses the same formula internally.