A4, exactly on pitch at the standard tuning reference. Anything between roughly 427 and 453 Hz is still nearest to A4, just sharp or flat by some number of cents.

What does the cent value tell me?

How far the frequency is from the nearest note in hundredths of a semitone. Positive is sharp, negative is flat. Within about five cents is close enough to read as in tune; over twenty is clearly off.

How do I use this on a resonance I found while mixing?

Note the frequency your EQ is boosting, enter it here, and you get the note name. That tells you whether the resonance is musically related to the track — a resonance on the root is a different decision from one on a random pitch.

Why does the nearest note change if I change the tuning reference?

Because the whole grid of note frequencies moves with the reference. At A4 = 432 Hz, 440 Hz is no longer A4 exactly — it is about 32 cents sharp of it.

Free tool

Frequency to Note

Turn a frequency in hertz into the nearest note, octave and cent deviation — the fast way to find out whether an EQ move is musical.

Runs locally. No upload, no audio required.

Frequency

Frequency (Hz)

Anything from sub bass to air.

Tuning reference

Nearest note

Deviation

0 ¢

In tune

MIDI note

Exact note pitch

440 Hz

At this reference

Frequencies worth knowing

Common mixing frequencies and their nearest notes
Frequency	Nearest note	Usually about
	D#1 +48.7¢	Sub bass weight
	B1 -49.4¢	Kick fundamental
	A2 0¢	Bass guitar low A
	B3 +21.3¢	Boxiness region
	A4 0¢	Tuning reference
	B5 +21.3¢	Presence reference
	F#7 +23.3¢	Vocal intelligibility
	B8 +21.3¢	Air and sibilance

The "usually about" column is a rough convention, not a rule — instruments and mixes vary widely. Going the other way? Use Note Frequency Calculator.

Detail

How this works

The conversion inverts the note-frequency formula: n = 69 + 12 × log₂(f / A4). Rounding n gives the nearest note, and the leftover fraction, multiplied by 100, is the deviation in cents.

This is most useful with an EQ open. Once you know that the resonance you are cutting is a G2 and the track is in G minor, the decision changes: you may want to tame it rather than remove it, because it is part of the harmony rather than a problem.

FAQ

Frequently asked questions

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