[Voyager]

I got the following using the math from those pages,

G9: 25087.70790283 Hz
G10: 50175.41580564 Hz
G11: 100350.8316113 Hz

 

[bakhtiar]

440*2^(70/12) = 25087.7079028319
440*2^(82/12) = 50175.4158056639

n^m means n powered by m.

 

[JeffKiel]

I must have had bad figures to start with, hence the error increasing in doubling to go from G4 to G10. Take everyone else's numbers for the frequency.