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Audio Reference Matrix

Note Frequency Chart (Hz & MIDI)

Full equal temperament frequency table from C0 (16.35 Hz) to B8 (7902.13 Hz) based on A4 = 440 Hz. Complete MIDI note reference.

NoteOctaveMIDI NumberFrequency (Hz)
C01216.35 Hz
C#01317.32 Hz
D01418.35 Hz
D#01519.45 Hz
E01620.60 Hz
F01721.83 Hz
F#01823.12 Hz
G01924.50 Hz
G#02025.96 Hz
A02127.50 Hz
A#02229.14 Hz
B02330.87 Hz
C12432.70 Hz
C#12534.65 Hz
D12636.71 Hz
D#12738.89 Hz
E12841.20 Hz
F12943.65 Hz
F#13046.25 Hz
G13149.00 Hz
G#13251.91 Hz
A13355.00 Hz
A#13458.27 Hz
B13561.74 Hz
C23665.41 Hz
C#23769.30 Hz
D23873.42 Hz
D#23977.78 Hz
E24082.41 Hz
F24187.31 Hz
F#24292.50 Hz
G24398.00 Hz
G#244103.83 Hz
A245110.00 Hz
A#246116.54 Hz
B247123.47 Hz
C348130.81 Hz
C#349138.59 Hz
D350146.83 Hz
D#351155.56 Hz
E352164.81 Hz
F353174.61 Hz
F#354185.00 Hz
G355196.00 Hz
G#356207.65 Hz
A357220.00 Hz
A#358233.08 Hz
B359246.94 Hz
C460261.63 Hz
C#461277.18 Hz
D462293.66 Hz
D#463311.13 Hz
E464329.63 Hz
F465349.23 Hz
F#466369.99 Hz
G467392.00 Hz
G#468415.30 Hz
A469440.00 Hz
A#470466.16 Hz
B471493.88 Hz
C572523.25 Hz
C#573554.37 Hz
D574587.33 Hz
D#575622.25 Hz
E576659.26 Hz
F577698.46 Hz
F#578739.99 Hz
G579783.99 Hz
G#580830.61 Hz
A581880.00 Hz
A#582932.33 Hz
B583987.77 Hz
C6841046.50 Hz
C#6851108.73 Hz
D6861174.66 Hz
D#6871244.51 Hz
E6881318.51 Hz
F6891396.91 Hz
F#6901479.98 Hz
G6911567.98 Hz
G#6921661.22 Hz
A6931760.00 Hz
A#6941864.66 Hz
B6951975.53 Hz
C7962093.00 Hz
C#7972217.46 Hz
D7982349.32 Hz
D#7992489.02 Hz
E71002637.02 Hz
F71012793.83 Hz
F#71022959.96 Hz
G71033135.96 Hz
G#71043322.44 Hz
A71053520.00 Hz
A#71063729.31 Hz
B71073951.07 Hz
C81084186.01 Hz
C#81094434.92 Hz
D81104698.64 Hz
D#81114978.03 Hz
E81125274.04 Hz
F81135587.65 Hz
F#81145919.91 Hz
G81156271.93 Hz
G#81166644.88 Hz
A81177040.00 Hz
A#81187458.62 Hz
B81197902.13 Hz

Note Frequency Reference — A4=440Hz Equal Temperament

This complete note frequency chart covers the entire MIDI range from C0 (MIDI 0, 16.35 Hz) to B8 (MIDI 107, 7902.13 Hz), based on the international standard of A4 = 440 Hz using equal temperament tuning. The table is useful for audio engineers setting up synthesizer oscillators, musicians understanding pitch relationships, and anyone working with digital audio.

A4 (440 Hz) is highlighted in blue. Each octave doubles the frequency: A3 = 220 Hz, A4 = 440 Hz, A5 = 880 Hz. This logarithmic relationship means our ears perceive consistent pitch intervals across all octaves.

FAQ

Frequently Asked Questions

What tuning standard is used for this frequency table?
The table uses equal temperament tuning based on the international pitch standard A4 = 440 Hz, the globally accepted concert pitch.
What is Middle C on the MIDI and frequency scale?
Middle C is C4 (MIDI note 60) with a frequency of 261.63 Hz. It forms the center reference point for the entire MIDI standard.
What is the frequency range of human hearing vs this table?
The table covers C0 (16.35 Hz) to B8 (7902.13 Hz). Human hearing typically ranges from 20 Hz to 20,000 Hz. The lowest octave (C0–B0) is felt more than heard.
How is frequency calculated from a MIDI note number?
Frequency = 440 × 2^((MIDI − 69) / 12). MIDI note 69 is A4 = 440 Hz. Each semitone is a factor of the 12th root of 2 (≈1.059463).
What is A4 = 440 Hz?
A4 (the A above middle C) is defined as exactly 440 Hz. This is the global standard concert pitch used by orchestras and instrument manufacturers worldwide.
What is the difference between equal temperament and just intonation?
Equal temperament divides the octave into 12 equal semitones (each 2^(1/12)). Just intonation uses pure integer ratios. Equal temperament allows playing in all keys equally but each interval is slightly imperfect.
Why do some notes have two names (e.g., C# and Db)?
C# and Db are enharmonic equivalents — they sound the same pitch but are spelled differently depending on the key signature. Keys with sharps use C#; keys with flats use Db.
What is the highest note on a piano?
The highest note on a standard 88-key piano is C8 (MIDI 108), frequency 4186.01 Hz. The lowest is A0 (MIDI 21), frequency 27.50 Hz.