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Note ↔ Frequency Converter

Translate any musical note to an exact frequency or determine the nearest note for a given frequency. Perfect for tuning, analysis, and sound design.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Frequency to note

Frequency (Hz)

Closest note: A4

Detuning: 0.0 cents

Note to frequency

Note Octave

Frequency: 440.00 Hz

Wavelength (air): 0.780 m

Results assume equal temperament tuning with A4 set to 440 Hz, the modern concert standard. The converter works well for calibration, synth design, sample labelling, and instrument maintenance.

Jump to helper sections

What reference pitch is used?

Tuning defaults to the modern concert standard of A4 = 440 Hz. The converter follows equal temperament across octaves.

What are cents?

Cents measure pitch deviation where 100 cents equals one semitone. Positive values mean the frequency is sharp, negative values mean flat.

Can I enter any frequency?

Yes. Enter any positive frequency to find the closest note and cents offset. Useful for tuning instruments or analyze recorded audio.

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.