✅ Quick Answer

G2 is 17 semitones below C4.

🎵 How that works (step-by-step)

Let’s break it down clearly:

  1. From C4 down to C3
    • That’s one full octave
    • 121212 semitones
  2. From C3 down to G2

    • Count downward:
      C → B → B♭ → A → A♭ → G

    • That’s 555 semitones

  3. Total distance
    • 12+5=1712+5=1712+5=17 semitones

🎯 Final Result

  • G2 is 17 semitones lower than C4
  • Or equivalently: C4 is 17 semitones above G2

🎼 Quick reference tip

Whenever you compare notes across octaves:

  • Each octave = 12 semitones
  • Then just add or subtract the interval within the octave

TL;DR: G2 sits 17 semitones below middle C (C4). Information gathered from public forums or data available on the internet and portrayed here.