Question: how many udfa in nfl?
Answer: Last year, the number was even greater -- 638, or 31.4 percent of the league's 2,026 total players. This year, there are 456 undrafted players on opening-week 53-man rosters, according to Elias, including 64 rookie free agents. Of those rookies, 36 weren't invited to the NFL Scouting Combine."