I’ve come up with some calculations for Sasuke’s speed circa the end of the Chuunin Exams, which should come in handy (I’ve used some of these same calculations before, but I’ve collected more data this time around). Since Sasuke’s speed at the time was said to be roughly equal to Rock Lee with his weights removed, I’ll look at Lee first. In this image:
You can see Lee moving so fast that he vanishes from Dosu’s eyesight. According to this website:
http://www.shininghalf.com/soujiro/s...i.html#brother
Lee would probably need to move at least 120 miles per hour in order to pull off that feat with a normal person.
Note: It is possible that Lee was using the First Gate to increase his speed here, but I consider it unlikely; every time Lee’s used the Lotus technique he’s barely been able to move afterwards, but, when Lee performed Dancing Leaf Shadow on Sasuke, he was able to run laps around Konoha immediately afterwards, which implies that the Gates’ power doesn’t come in until the Lotus attack proper (a.k.a. the spinning part).
But 120 mph is for normal humans. Dosu is a ninja and has demonstrated greater than human reaction time. First he uses a sound jutsu to break apart this log that was falling towards him at the same time he was jumping towards it.
Then, later, he dodges a kunai thrown by Sakura.
Who earlier had shown the ability to throw a kunai fast enough to pin Naruto to a tree from many feet away before he can begin falling.
This indicates at least a small degree of superhuman reaction time, let’s say twice what a normal human being would be capable of. If this is the case, then Lee would have to be moving at 240 mph to vanish from Dosu’s sight.
But that’s Lee with his weights on; how fast is Lee with his weights removed. Well, we can determine that by figuring out the mass of his leg weights. In the room where the Chuunin Exam prelims took place, we see one of Orochimaru’s henchmen, Yoroi Akado, cracking the floor after falling from roughly the same height Lee would later drop his weights from.
However, since Sasuke kicked Yoroi downwards at the same moment he hit the floor, Yoroi hit the ground with more than just the force of gravity. Considering a kick from Sasuke could knock Yoroi that high in the air in the first place, it seems reasonable to say that Yoroi hit the ground with twice the force he would have if he fell normally. According to Yoroi’s entry in Wikipedia (which I trust someone will correct me on if it’s inaccurate), he weighed 70 kilograms (
http://en.wikipedia.org/wiki/Land_of_Sound#Yoroi_Akado. Of course, all that weight didn’t hit the ground at once; it was mainly just his torso, which we can say makes up about a third of his weight, or 23 kilograms, which means he hit the floor with the force that a 46 kilogram weight would if falling from that height.
Now compare the cracks Yoroi’s fall made with the craters Lee’s weights made when dropped from roughly the same height:
Given the greater destruction caused by Lee’s weights, I’d say they hit the ground with at least five times the force that Yoroi did, meaning each leg was carrying around 230 kilograms, for a total of 460 kilograms. Rock Lee’s weight is about 50 kilograms (
http://en.wikipedia.org/wiki/Rock_Lee).
This means that, when Lee wears his weights, he weighs 510 kilograms, roughly ten times what he weighs when his weights are removed. Since Lee’s leg muscles exert the same force whether his weights are on or not, we can figure it out using the scientific equation Force = Mass x Acceleration, or, rephrased for our purposes, Acceleration = Force/Mass. This equation means that, if the Force exerted remains constant, but Mass is decreased to 10% of what it previously was, then Acceleration will increase ten times. Therefore, when Lee takes his weights off, his speed goes from 240 miles per hour to 2400 miles per hour, which roughly comes to 1100 meters per second.
Here’s where Sasuke comes into play. For starters we see Sasuke fight more than Rock Lee, so determining other characters speed from his is simpler. Second, so far this is just movement speed, not reaction speed, but we can figure out Sasuke’s reaction speed from these scans:
Sasuke charges at Gaara’s sand shell at full speed and simultaneously avoids the sand spikes that come off of it. We see the sand spikes being maybe a few inches long in the first scan, and then some over a meter long in the next, all in the time it took for Sasuke’s Chidori to go from half a foot from the sand shell to piercing it, but let’s be cautious and say they’re only going half as fast as Sasuke was running, 550 m/s. So Sasuke’s approaching the spikes at 1100 m/s, and the spikes are approaching Sasuke at 550 m/s, which means Sasuke could dodge attacks that were, from his perspective, coming at him at 1650 m/s. So the grand total is:
Sasuke Uchiha:
Movement Speed: 1100 m/s
Reaction Speed: 1650 m/s
Keep in mind this is Sasuke at the end of the Chuunin Exams without the aid of the Cursed Seal. With a three-tomoe Sharingan, timeskip training, and the added chakra of the Cursed Seal, current Sasuke is undeniably faster in both categories. How much faster is something I can’t really find enough evidence to speculate on at this point.