Adult male trumpeter swans can weigh between 11.3 to 17.6 kilograms (25 to 39 pounds). They are typically larger and heavier than females, with an average weight of around 15 kilograms (33 pounds).
Adult female trumpeter swans, on the other hand, usually weigh between 9 to 13.6 kilograms (20 to 30 pounds). Their average weight is about 11.3 kilograms (25 pounds), making them slightly smaller and lighter than males.
These weight ranges can vary depending on factors such as the individual swan's age, health, diet, and overall physical condition.