It depends which whale you are talking about, and no one has ever weighed just the tail but here are some estimates. Blue Whale...about 1/2 ton, Beluga Whale...80-90 pounds. Hope it helps.
The largest whales (blue whales) weigh 100 to 150 tons.
It weigh 50 pd
About half a ton.
1.5 tons
about 7,000 pounds
7kg
a sperm whales head ways about 5 tons (tonnes)
for balance
6 kl
it weighes about 5 tons!
3 tons or 6000 lbs
Blue whales don't have a specific average weight. They do have a range which is round 100-120 tons. However, Blue whales can weigh as much as just over 200 tons.