Average Length of a Great White Shark
The average length of a great white shark is typically 4.0 to 5.2 meters (13 to 17 feet) for mature individuals, with females generally larger than males. According to the Florida Museum's Ichthyology Department, mature females average around 4.6 to 4.9 meters (15 to 16 feet), while mature males average 3.4 to 4.0 meters (11 to 13 feet). The largest reliably measured great white shark was a female caught off the coast of Cuba in 1945, measuring 6.1 meters (20 feet), though unverified reports suggest sizes up to 7 meters (23 feet). For more details on shark measurements, see the Florida Museum's shark research page Florida Museum Ichthyology.
Newborn great white sharks measure about 1.2 to 1.5 meters (4 to 5 feet) in length. Juveniles grow rapidly during their first decade, reaching 2.5 to 3.5 meters (8 to 11 feet) by age 10. Sexual maturity is reached at around 9 to 10 years for males and 14 to 15 years for females, at which point they achieve their average adult length. Growth rates slow after maturity, but sharks continue to increase in length slowly throughout their lives, which can span 70 years or more according to recent studies.
Size Comparison and Regional Variations
Great White Shark vs. Other Large Sharks
Compared to other large shark species, the great white shark's average length places it among the top predators. The average length of a great white shark is shorter than the average whale shark, which reaches 9 to 12 meters (30 to 40 feet), but larger than the average tiger shark, which is typically 3.25 to 4.25 meters (10 to 14 feet). The average length of a great white shark also exceeds that of the bull shark, which averages 2.0 to 3.5 meters (6.5 to 11.5 feet). The Ocean Conservancy provides additional size comparisons of marine predators Ocean Conservancy Shark Facts.
Regional Size Differences
Great white sharks in the Northeast Pacific, particularly around the Farallon Islands and Guadalupe Island, include some of the largest individuals on record. Males in this region average 3.4 to 4.3 meters (11 to 14 feet), while females average 4.6 to 5.2 meters (15 to 17 feet). In the Southern Ocean around Australia and South Africa, average sizes are similar, though some studies suggest slightly smaller averages in the Indian Ocean population. The National Oceanic and Atmospheric Administration (NOAA) Fisheries tracks shark size data across regions NOAA Fisheries White Shark.
Factors Influencing Great White Shark Size
Sexual Dimorphism in Length
Sexual dimorphism is a primary factor in the average length of a great white shark. Females are consistently larger than males, a pattern observed across many shark species. This size difference is thought to be related to reproductive needs, as larger females can carry more offspring and have higher survival rates for their young. The size difference becomes more pronounced after sexual maturity, with adult females averaging 0.5 to 1.0 meter (1.6 to 3.3