Frequency → note
Note → frequency
How it works
The converter uses equal temperament: n = 69 + 12·log₂(f / A4). The nearest whole number is the MIDI note; the remainder × 100 is the deviation in cents (hundredths of a semitone).
Change the A4 reference to work with 432 Hz, 442 Hz orchestral pitch or 415 Hz Baroque tuning.
Frequently asked questions
What note is 432 Hz?
Slightly flat of A4: about −32 cents relative to 440 Hz.
How many cents can people hear?
Trained listeners notice differences of about 5 cents between successive tones; most people need 10–25 cents.