About this tool
Convert between musical note names and frequencies using 12-tone equal temperament with A4 = 440 Hz, including the cents offset, all in your browser.
Frequently asked questions
What tuning reference is used?
Standard concert pitch with A4 = 440 Hz and twelve equal semitones per octave, the 12-TET system.
What does the cents value mean?
Cents show how far a frequency is from the nearest note; 100 cents equals one semitone, so a small offset means it is slightly sharp or flat.