Seating capacity at Cal Memorial has fluctuated throughout its history.  When it opened in November 1923, the official capacity was close to 80,000 seats.  I have yet to find an official number for the original official capacity.  During the Pappy Waldorf years (1947-1956), there were several games where attendance was listed at 83,000, the 1947 Navy and USC games being just two such events.  The additional capacity was realized by installing temporary bleachers above the East Rim.  Once those temporary bleachers were dismantled in the early 1960s, the official seating capacity at Cal Memorial has never been more than 75,662. Seating capacity has dropped over time as seating for patrons in wheelchairs was added, primarily in sections on the East Side, necessitating the removal of seats for people who do not require wheelchairs. 
 Seating capacity at Cal Memorial will drop significantly due to the West Side Renovation (aka Phase II).  Row depth that had been 22 to 24 inches when the stadium opened in 1923, will now be anywhere from 30 inches to 33 inches on the reconstructed sections of the West Side (Sections VV through XX; Sections A through MM), and as much as 36 inches deep in the University Club area in the Press Box.  Seat widths will also widen in the rebuilt sections depending on location (18-22 inches wide).