Hz to Musical Note Converter – frequency to note

The calculator measures your frequency against the reference pitch (A4 = 440 Hz by default) in equal temperament: 12 × log₂(f / 440) gives the distance in semitones, which maps onto note names C, C#, D … B and an octave number, with middle C near C4. The fractional part becomes a cents deviation — 100 cents equals one semitone, and anything under about 10 cents reads as in tune to most ears.

1. 1

   Step 1

   Enter the frequency in hertz

2. 2

   Step 2

   Set the reference pitch (440 Hz standard)

3. 3

   Step 3

   Read the nearest note and octave

4. 4

   Step 4

   Check the cents deviation for tuning accuracy