# Convert pitch between Hz and music notation

If more than one box has a valid entry, the first one is used.

## Details

### Hertz

The frequency of a pitch in Hertz (Hz) is the number of cycles per second. For example, an A 440 has a pitch of 440 Hz, 440 vibrations per second.

### Musical notation

This page uses so-called **scientific pitch notation**. The C near the lower threshold of hearing is denoted C0. The C one octave higher is C1. The C two octaves above C0 is C2, etc. Middle C is C4.

Notes besides C's take their octave number from the nearest C below. For example, the lowest note on a standard piano is A0, the A above C0. More details here.

In the form above use 'b' (the second letter of the English alphabet) for flat symbol ♭. So, for example, Eb4 is the E-flat above middle C.

If a frequency doesn't correspond exactly to a chromatic note, the difference is given in cents, where a cent is a hundredth of a semitone. For example, 440 Hz is A4 and 450 Hz is A4 + 39 cents.

More calculators like this one.

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