In the NFL, 10 yards are needed for a first down, but penalties and plays can affect it.
10 Yards is the First Down.
Normally 10 yards, but if you needed to get to the one yard line but kept losing yardage you could possibly need to go 98 yards
The original football field was 140 yards long. It shrank in the late 19th century to 110 yards (where it remained in Canada), and then to 100 yards.
6 yards for first down on first play after that it is 20 yards for each 1st down
the 1st football feild was 120 yards because there was 10 more yards behind each feild goal.
Ten yards equals thirty feet.