TA-04 / PITCH

Note Frequency & MIDI Calculator

Convert notes to Hz and MIDI, or enter any frequency to find the nearest note and cents offset. Adjustable A4 reference included.

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TA-04 / PITCH

Note ↔ Frequency / MIDI

Pitch conversion for musicians, synth users and audio work.

12-TET

REFERENCE A4

NOTE SPELLING

NOTE → FREQUENCY

OSC / MIDI

NOTE OCTAVE

FREQUENCY440.000 Hz

MIDI NOTE69

PERIOD2.273 ms

12-TET FORMULAf = A4 × 2^((MIDI − 69) / 12)

FREQUENCY → NOTE

ANALYZE

INPUT FREQUENCY

NEAREST NOTEA4

CENTS OFFSET+0.0 ¢

TARGET FREQUENCY440.000 Hz

−50 ¢ ← 0 → +50 ¢

How note frequency is calculated

In 12-tone equal temperament, each semitone changes frequency by the twelfth root of two. A4 is normally 440 Hz, but you can change the reference for alternate or historical tuning.

What the cents value means

A cent is one hundredth of a semitone. A positive value means the entered frequency is sharp of the nearest equal-tempered note; a negative value means it is flat.