Frequency to Note Converter
Enter a frequency in Hz to find the nearest musical note, octave, and how many cents sharp or flat it is.
A4
0 cents from 440 Hz
Common Frequencies
How Frequency Relates to Pitch
Every musical note corresponds to a specific frequency. The standard tuning reference is A4 = 440 Hz. Each octave doubles the frequency, so A5 = 880 Hz and A3 = 220 Hz. The 12 notes within each octave are spaced by equal ratios (equal temperament).
What Are Cents?
Cents measure how far a frequency is from the nearest note. One semitone = 100 cents. A reading of +20 cents means the frequency is slightly sharp (above the note), while -20 cents means it is slightly flat (below the note).