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Qalc AI
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Note Frequency Calculator
All misc tools
Calculate musical note frequencies in Hz.
Note to Frequency
Note
C
C#
D
D#
E
F
F#
G
G#
A
A#
B
Octave
0
1
2
3
4
5
6
7
8
Frequency
440.00
Hz
Wavelength: 0.780 m
Frequency to Note
Input Frequency (Hz)
A
4
Flat
Sharp
0.0 cents
Set 432 Hz
Set 440 Hz
About this calculator
Overview
Musical note frequencies follow exponential scale. A4 = 440 Hz (standard tuning). Each semitone = 2^(1/12) frequency ratio. Essential for tuning, synthesis, and audio engineering.
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Pro Tips
A4 = 440 Hz (concert pitch standard).
Each octave doubles frequency.
C4 (middle C) = 261.63 Hz.
Equal temperament: all semitones equal ratio.
!
Fun Facts
"A4 = 440 Hz adopted 1939 (international standard)."
"Lowest piano note (A0): 27.5 Hz."
"Highest piano note (C8): 4,186 Hz."
"Human hearing: 20 Hz to 20,000 Hz."
Formula: f = 440 × 2^(n/12) where n = semitones from A4
