The short answer: An adult humpback whale typically weighs between 25,000 and 40,000 kilograms (about 55,000 to 88,000 pounds), which is roughly 25 to 40 metric tons.
Humpback whale weight by type
Humpback weight varies with age, sex, and condition. Here are rough figures.
| Type (example) | Typical weight |
|---|---|
| Newborn calf | About 700 to 1,000 kg (1,500 to 2,200 lb) |
| Juvenile | About 10,000 to 20,000 kg (22,000 to 44,000 lb) |
| Adult male | About 25,000 to 30,000 kg (55,000 to 66,000 lb) |
| Adult female | About 30,000 to 40,000 kg (66,000 to 88,000 lb) |
What affects humpback whale weight
- Sex. Females are typically a bit larger and heavier than males.
- Age. Whales gain mass for years before reaching full adult size.
- Feeding season. Whales build blubber in summer feeding grounds and lose weight while breeding.
- Region. Populations in different oceans vary slightly in average size.
- Pregnancy. A pregnant or recently fed female carries extra weight.
How humpback whale weight compares
An adult humpback at about 30,000 kg weighs roughly the same as five or six African elephants combined.
Frequently asked questions
How much does a baby humpback whale weigh?
A newborn humpback calf weighs about 700 to 1,000 kilograms and is around 4 to 5 meters long at birth.
Are humpback whales bigger than killer whales?
Yes, by a wide margin. Humpbacks can weigh over 30 metric tons, while killer whales usually weigh under 6 metric tons.
Why do humpback whales lose weight?
Humpbacks feed heavily in summer and then fast during migration and breeding season, so they can lose a large share of their body weight.
