Average hieght for a general office space

what is the general office space height in meters or ft for a general business maybe salon , doctors office, colmamdo, dentist, ect....

example Feet to Meters
1 = 0.305
2 = 0.610
3 = 0.914
4 = 1.219
5 = 1.524
6 = 1.829
7 = 2.134
8 = 2.438
9 = 2.743
10= 3.048
20= 6.096