About 800 pounds per sq inch.

They say he could kill a full grown cow with a single punch.

all i know is that he punched hard enough to knock someone out. i also know that he was able to punch 4 times in like a second . not only jabs but also hooks.

Mike Tyson never had his punching power measured. I believe there was little need to except for the wanting to pleasure one's curiosity. In order for this to be possible, a device for measuring velocity and impact would need to be inserted into say a heavybag. There is a device that can be used to do this. It is called the Zimmer System and there are other devices like it. I would say - and this is a shot in the dark - that Iron Mike in his prime could probably score around 1600-1800 psi on a right cross. Maybe 800-900 psi on a hook and probably around 400-600 psi on an uppercut. As for actual data, again you would need to have a device for measuring that exactly. I will say that a wealter weight champion, Ricky Hatton, scored an impressive 400kg on a right cross using the Zimmer System. This is equal to half a ton. In other words, he punched around 1,000 lbs on a right cross. Now Hatton, again, is not a heavyweight, nor is he Mike Tyson. So take Hatton's score and give it a meaty bump and you'll get the idea. Mr. Tyson would have enough force - back in his prime especially - to not only knock out an average man, but hospitalize him, causing serious brain damage, facial fractures, sinus-hemorging and God only knows what else. The poor dude would probably get a broken neck to add to the list of other problems a right cross from Iron Mike is capable of doing. Perhaps someone should mail the Myth Busters who can rig up a device and call over Mr. Tyson for a punch party.

Out of 50 wins, he had 44KO's, 22 in the first round.

Extremely bloody hard....................

He was one of the hardest punchers of all time. The list includes George Forman and Ernie Shavers. These 3 men were probably the hardest hitters in boxing ever.