Note Frequency Calculator

Your details

Note-to-frequency converts a selected note to Hz. Frequency-to-note finds the nearest note for any Hz value you enter.
Chromatic note name. Sharps and their flat equivalents are listed together.
Octave number in scientific pitch notation. Octave 4 contains middle C (C4) and concert A (A4).
The pitch of concert A4 that all other note frequencies are derived from. 440 Hz is the global standard.
Frequency
440Hz

The exact pitch of this note in hertz

MIDI note number69
Wavelength0.7795m
Period2.2727ms
Nearest noteA4
Cents off nearest note0cents
Frequency (Hz)440
Wavelength (m)0.7795

A4 = 440.0000 Hz

  • A4 vibrates at 440.0000 Hz in equal temperament.
  • One octave up (A5) is 880.00 Hz; one octave down (A3) is 220.00 Hz.
  • The sound wave is 0.780 m long and repeats every 2.273 ms.
  • MIDI note number 69 maps this note to standard digital audio workstations.

Next stepUse the frequency-to-note mode to reverse-check any Hz value and see its cent deviation from equal temperament.

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