Of 19.5 million total female high school basketball players in the United States for the 2021-22 school year:
There were 1,105 total DI women's basketball players at the 351 DI women’s basketball colleges during that same 2021-22 school year.
That means only about 0.0057% of all high school girls basketball players in the United States go on to play basketball for an NCAA D1 school.