How big is a spinosaurus?

About 14-17m long and 10 tonnes.

Answer:

There is some ongoing discussion on this. Initial estimates were 6 tons in weight and 15 meters (49 ft) in length. Some studies postulated a lower mass. More recent estimates are that Spinosaurus was 16 to 18 metres (52 to 59 ft) long and 7 to 9 tonnes (7.7 to 9.9 short tons) in weight