The NFL at its own website has very extensive player profiles of draft prospects and assigns them all a grade on a 10-point scale.
Here’s the breakdown of the grading scale:
9.0-10.0 – Once in a lifetime player.
8.0-9.0 – Perennial All-Pro.
7.50-7.99 – Future All-Pro.
7.00-7.49 – Pro Bowl to All-Pro Ability.
6.50-6.99 – Good NFL starter with Pro Bowl Potential.
6.00-6.49 – Chance to become a good NFL starter.
5.70-5.99 – Could become early NFL starter.
5.30-5.69 – Backup or eventual starter.
5.15-5.29 – Developmental prospect or special teams potential.