1 point for every 10 yards of passing, after the first 100. 
           (ex. 183 yds = 8 pts, 98 yds passing = 0 pts)
1 point for every 10 yards of rushing/receiving
            (ex. 22 yds = 2 pts)
6 pts for any touchdowns (thrown, caught, or rushed by player)
2 pts for every 2 pt conversion (thrown, caught, or rushed by player)
6 points for TDs scored as an offensive fumble recovery
            1 point for each 10 yards the ball is advanced while recovering for a score

1 pt for each extra point kicked
3 pts for each 1 - 39 yd FG
4 pts for each 40 - 49 yd FG
5 pts for each 50 - 59 yd FG
10 pts for each 60 + yd FG

10 pts for holding a team to 0 points
6 pts for holding a team to 1-7 points
6 pts for each TD scored on an interception return
         1 point for each 10 yards during the scoring return
6 pts for each TD scored on a punt, kickoff, or missed FG return
         1 point for each 10 yards during the scoring return
6 pts for each TD scored on a defensive fumble recovery
         1 point for each 10 yards the ball is advanced on the scoring recovery
3 pts for each blocked punt, extra point, or field goal
2 pts for each safety
2 pts for each interception
2 pts for each defensive fumble recovery
1 pt for each sack

Note: 

Individual offensive players involved in Defensive Returns do not score points - all points scored for
defense returns (Punt, Kick, Interception, Defensive Fumble Recovery) are earned by D/ST spot.
See Ex 2 below.

         

 Ex 1) Donovan McNabb throws for 145 yards in a game and rushes for 27 yards.

Ex 2) Bryan Westbrook returns a punt 34 yards for a TD.
       
Ex 3) Philip Rivers hits Antonio Gates for a 31 yard pass. 
          Brian Urlacher strips the ball and recovers the fumble.
          Urlacher runs the ball back 47 yards for a TD.

 Ex 4) Philip Rivers hits Antonio Gates for a 31 yard pass. 
          Brian Urlacher strips the ball and recovers the fumble.
          Urlacher runs the ball back 47 yards and is stopped at the 13 yd line.

Ex 5) Philip Rivers hits Antonio Gates for a 31 yard pass. 
         Brian Urlacher strips the ball but Chris Chambers recovers the fumble for the Chargers
         (behind where Gates lost it or by restripping the ball from a Bear).
         Chambers is able to run with the ball 61 yards and scores a TD.

Ex 6) Rivers hits Gates for a 31 yard pass.
         Brian Urlacher strips the ball but Chris Chambers recovers the fumble for the Chargers
          (behind where Gates lost it or by restripping the ball from a Bear).
          Chambers is able to run with the ball 61 yards and is stopped at the 2 yard line.
   
Ex 7) Bryan Westbrook rushes for 127 yards and has 47 yards receiving. No TD's.