According to NOAA:
Males can weigh up to 22,000 pounds (10,000 kg)
Females can weigh up to 16,500 pounds (7,500 kg)
Male killer whales tend to weigh over 6 tons (12,000 lbs.) Female killer whales tend to weigh 3-4 tons (6,000-8,000 lbs.)
Orcas can weigh up to 5 tons to 7 tons
males can weigh from 10-11 tons and females can weigh from 7-8 tons.