Heaviest human brain recorded weighed 2.3 kg
The heaviest human brain ever recorded according to Guinness was of a 30-year-old US male which weighed 2.3 kg. The record was first reported in 1992 and remains unbroken since then. In comparison, the brain of an average man weighs about 1.4 kg whereas Albert Einstein's brain reportedly weighed slightly below average at 1.23 kg.