Most vampires acquire superhuman strength anywhere from three to five times as great as they had in their mortal lives.

Moreover, a vampire’s speed, agility, and reflexes are up to five times as great as they had in their mortal lives. All vampires possess acute hearing (equivalent to that of a wolf) and night vision, enabling them to see with better than 20/20 perceptibility in total darkness.

As a vampire grows "older" over the years its strength can increase, and the strength level of Vampire Regents can be 10 - 20 times stronger than they were in their mortal lives.

Dracula is described as having the strength of twenty strong men.