Squad – 6 men + Sergeant, 7 total
Platoon – 28 men + Officer and Sergeant Major (4 squads), 30 total
Company – 150 men + 6 Command staff (5 platoons), 156 total
Battalion – 624 men + 16 Command staff (4 Companies), 640 total
Regiment – 2560 men + 32 command staff (4 battalions), 2,592 total
Brigade – 15,552 men + 72 command staff (6 regiments), 15,624 total
Interestingly, this organization is different from what is seen at Kamino and when boarding on Coruscant. At Kamino they march in units of 91, on Coruscant in two units of 101. While the Kamino shots would fit with 3 platoons of 30 being escorted by an instructor, the Coruscant shot is an outlier. Perhaps they are organized differently due to the build of the ships berthing, where they are being escorted? If there were only 100 racks one would not bring the whole unit there.
This is a peculiar discrepancy. The lack of information and its jarring discontinuity from the rest of the Clone Wars era information make it a target for further investigation in search of a way to harmonize the divergent data points.