There is no definitive answer to this question as it depends on a number of factors, including the person's height, weight and body composition. However, according to some estimates, the average human head weighs between 8 and 12 pounds (3.6 and 5.4 kg).
The heaviest recorded human head weighed in at 19 pounds (8.6 kg). This was the case for a man named Charles Byrne, who lived in the 18th century. Byrne had a condition known as hydrocephalus, which caused his head to swell to an abnormal size. When he died, his body was put on display in London's Hunterian Museum â€“ where it remains today.
While Byrne's head is certainly the heaviest on record, there are other individuals who have come close to matching his weight. In 2014, a baby boy in India was born with a head that weighed nearly 17 pounds (7.7 kg). And just last year, another baby boy from Guatemala made headlines when he was born with a 16-pound (7.3 kg) head â€“ making him one of the heaviest babies ever born!