Sonny Bill Williams is a 39-year-old . We trawled the web to determine that Sonny Bill Williams' height is 6ft 3 ½ (191.8 cm). This makes him 6.4 inches taller than the average male in the United States. Are you looking for more information about Sonny Bill Williams and his career? We found resources at co.nz, rleague.com, co.uk, sports-reference.com & boxrec.com.