Free Frequency to Note Converter

Type a frequency to see which note it is and how far it is out of tune, or pick a note to get its exact frequency in hertz. You can listen to every result.

Online Pitch to Hz Calculator

Every musical note has a frequency, measured in hertz (Hz). This calculator translates between the two in both directions, using equal temperament and the A4 reference you choose.

What Does the Converter Show?

  • Hz to note: the nearest note with its octave, how many cents the frequency lies above or below it, the exact frequency of that note and its MIDI number.
  • Note to Hz: the frequency of any note from C0 to B8.
  • Sound: a Play button next to each result, so you can hear the tone.
  • Tuning reference: A4 is 440 Hz by default; you can set it anywhere from 400 to 480 Hz, for example to 432 or 442.

How Is a Note Calculated from a Frequency?

In equal temperament, each semitone multiplies the frequency by the twelfth root of 2 (about 1.0595), and an octave doubles it. Starting from A4 = 440 Hz, the number of semitones between a frequency f and A4 is 12 × log2(f / 440). The nearest whole number gives the note; the remainder, multiplied by 100, gives the cents. One semitone is 100 cents, so +50 cents is exactly halfway to the next note.

Who Is It For?

Producers tuning a kick drum or an 808 to the key of a track, mixing engineers checking whether a resonance they found with an EQ sits on a note of the song, sound designers setting oscillators and filters by note, and students of acoustics. To find the pitch of a voice or a recording first, read Hz to Note: How to Find the Pitch of a Voice.

How to Use the Converter in 3 Steps

Step 1

Enter a Value

Type a frequency in Hz in the first panel, or choose a note and an octave in the second.

Step 2

Read the Result

The note, the cents offset and the exact frequency appear at once.

Step 3

Listen

Press Play Tone to hear the frequency as a sine wave.

Frequency and Note Converter

Hz to Note

Nearest note
A4
Exact frequency of this note--
MIDI note number--

Note to Hz

Frequency (Hz)
440.00

Note Frequency Chart (A4 = 440 Hz)

Frequencies in hertz for every note from octave 0 to octave 8 in equal temperament. Middle C is C4; the lowest note of a standard piano is A0 (27.50 Hz) and the highest is C8 (4186.01 Hz).

Note 0 1 2 3 4 5 6 7 8
C 16.35 32.70 65.41 130.81 261.63 523.25 1046.50 2093.00 4186.01
C♯ / D♭ 17.32 34.65 69.30 138.59 277.18 554.37 1108.73 2217.46 4434.92
D 18.35 36.71 73.42 146.83 293.66 587.33 1174.66 2349.32 4698.64
D♯ / E♭ 19.45 38.89 77.78 155.56 311.13 622.25 1244.51 2489.02 4978.03
E 20.60 41.20 82.41 164.81 329.63 659.26 1318.51 2637.02 5274.04
F 21.83 43.65 87.31 174.61 349.23 698.46 1396.91 2793.83 5587.65
F♯ / G♭ 23.12 46.25 92.50 185.00 369.99 739.99 1479.98 2959.96 5919.91
G 24.50 49.00 98.00 196.00 392.00 783.99 1567.98 3135.96 6271.93
G♯ / A♭ 25.96 51.91 103.83 207.65 415.30 830.61 1661.22 3322.44 6644.88
A 27.50 55.00 110.00 220.00 440.00 880.00 1760.00 3520.00 7040.00
A♯ / B♭ 29.14 58.27 116.54 233.08 466.16 932.33 1864.66 3729.31 7458.62
B 30.87 61.74 123.47 246.94 493.88 987.77 1975.53 3951.07 7902.13

Frequently Asked Questions

Is the Frequency to Note Converter free?
Yes. The converter is free to use, with no sign-up and no limits.

How do I convert Hz to a musical note?
Type the frequency into the Hz to Note panel. The converter shows the nearest note, its octave and how many cents the frequency is sharp or flat.

What note is 440 Hz?
440 Hz is A4, the A above middle C. It is the international tuning reference from which the other notes are calculated.

What is the frequency of middle C?
Middle C (C4) is 261.63 Hz when A4 is tuned to 440 Hz.

What does the cents value mean?
A cent is one hundredth of a semitone. A value of +20 cents means the frequency is slightly above the note shown, and -20 cents slightly below. At 50 cents it is exactly between two notes.

What is 432 Hz tuning?
It means tuning A4 to 432 Hz instead of 440 Hz, which makes every note about 32 cents lower. Set the A4 reference to 432 to see all frequencies in that tuning.

Does the converter analyze my audio files?
No. It is a calculator: you enter a number or choose a note. To find the key of a song, use the BPM & Key Analyzer.

Do I need to install any software?
No. The tool runs in your web browser on computers, phones and tablets.