Humpback whales typically range from about 14 to 16 meters (46 to 52 feet) in length. Some individuals have been recorded at lengths up to 17 meters (56 feet) or slightly more, although records beyond 17-18 meters are considered unlikely. Females are generally larger than males, often by 1 to 1.5 meters (3 to 5 feet). In terms of weight, humpback whales usually weigh around 30 to 40 metric tons (approximately 27.5 to 40 tons). Calves are born at about 4.3 meters (14 feet) long and weigh around 680 kg (1,500 pounds). Their pectoral fins are notably long, about one-third of their body length, reaching up to 5 meters (15 feet) in length. In summary:

• Length: 14-16 meters (46-52 feet), occasionally up to 17 meters (56 feet)
• Weight: 30-40 metric tons (27.5-40 tons)
• Females usually larger than males
• Calves born about 4.3 meters (14 feet) long and 680 kg (1,500 pounds)
• Long pectoral fins about one-third of body length (up to 5 meters or 15 feet)

This size places humpback whales as large, but not the largest baleen whales, distinguished also by their long pectoral fins and robust body shape.