Ja Morant gets his head to the rim at about six-foot-three in shoes. That is ridiculous. On his highest two-foot jumps, I think he gets a little above it, which puts his maximum around 47 inches. But that does not mean he could dunk from 16 feet away, as a Sports Science segment suggested. Those are two very different jumps.
How I get to 47
The video uses six-foot-two as Ja's listed height. Add roughly an inch for shoes, and he needs about a 45-inch jump just to get the top of his head level with a ten-foot rim. That shoe allowance is an assumption, not an official barefoot measurement. We have seen him get his head near the rim more than once. In the highest clip I use, he looks about two inches above it. So I would put his best two-foot vertical close to 47.
I am not reading a decimal point off a broadcast angle. His head can tilt, his shoes change the height assumption, and another view of the same jump could look different. The point is that a number in the low 40s does not explain the jumps where his head reaches the rim.
Why the 16-foot dunk claim loses me
Sports Science took numbers from Ja's two-foot jumps and used them to project a dunk from roughly 16 feet away. But look at how Ja actually jumps: two feet are where he gets his best height. A long-distance dunk asks him to sprint in, take off on one foot, travel forward, hold the ball and still get high enough to finish. You cannot just take the height from one jump and paste it onto the other.
That does not make Ja a bad one-foot jumper. It means a two-foot max vertical is not a free-throw-line dunk prediction. There is no world in which the footage I have seen proves a 16-foot make.
The older number
In an earlier comparison with Shaedon Sharpe, I thought one Ja alley-oop was closer to 46 inches than the NBA's 43.8 graphic. The newer breakdown lands around 47 after looking at more of his highest jumps. That is a revised film estimate, not a claim that he gained an inch of measured vertical. The NBA vertical table keeps both videos in context, and the game-jump article explains why the clip you choose matters so much.