Super Time Ultra

Frequency to Note Converter

Convert frequency in hertz to musical note, octave, cents deviation, and MIDI note. Convert notes back to frequency with adjustable A4 reference pitch.

Convert between audio frequency and musical pitch for tuning, sound design, acoustics, and practice notes.

What this tool includes

Hz to note

Enter a frequency and see the nearest note, octave, MIDI number, and cents offset.

Note to Hz

Choose a note and octave to get its frequency at the selected A4 reference.

Reference pitch

Adjust A4 when working with ensembles or recordings that are not tuned to 440 Hz.

How to use this tool

  1. Enter a frequency or choose a note and octave.
  2. Check the calculated pitch and cents deviation.
  3. Adjust A4 if your tuning reference differs.
  4. Use audio preview to confirm the pitch by ear.

Practice tips

  • A small cents offset can matter in exposed sustained notes.
  • Use the tuner for live microphone pitch checking.
  • Use the drone when practicing intervals against a fixed reference.