G♯4 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 G♯4 is exactly 440 × 2^(-1/12) Hz. Under alternative references the note shifts with the reference: at A4 = 432 Hz, G♯4 becomes 407.75 Hz.
G♯ in every octave
| Note | Frequency | MIDI | Piano key |
|---|---|---|---|
| G♯1 | 51.91 Hz | 32 | 12 |
| G♯2 | 103.83 Hz | 44 | 24 |
| G♯3 | 207.65 Hz | 56 | 36 |
| G♯4 ← | 415.30 Hz | 68 | 48 |
| G♯5 | 830.61 Hz | 80 | 60 |
| G♯6 | 1661.2 Hz | 92 | 72 |
| G♯7 | 3322.4 Hz | 104 | 84 |
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 G4 at 392.00 Hz; one semitone up is A4 at 440.00 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.