F2 at a glance
All values assume twelve-tone equal temperament at the international standard pitch of A4 = 440 Hz. In that system every semitone has the same size - a frequency ratio of 2^(1/12) - so F2 is exactly 440 × 2^(-28/12) Hz. Under alternative references the note shifts with the reference: at A4 = 432 Hz, F2 becomes 85.72 Hz.
F in every octave
| Note | Frequency | MIDI | Piano key |
|---|---|---|---|
| F1 | 43.65 Hz | 29 | 9 |
| F2 ← | 87.31 Hz | 41 | 21 |
| F3 | 174.61 Hz | 53 | 33 |
| F4 | 349.23 Hz | 65 | 45 |
| F5 | 698.46 Hz | 77 | 57 |
| F6 | 1396.9 Hz | 89 | 69 |
| F7 | 2793.8 Hz | 101 | 81 |
Each octave doubles the frequency - the simplest relationship in music, and the reason notes an octave apart sound like “the same note, higher”.
Neighboring notes
One semitone down is E2 at 82.41 Hz; one semitone up is F♯2 at 92.50 Hz. Need a frequency between notes, or a different waveform? The tone generator plays anything from 20 Hz to 20 kHz; the note ↔ frequency converter does the math both directions, and the chromatic tuner listens to your instrument and shows the offset in cents.