As referenced in this video, here are the Drag factor scores for each team in the NL West in 2013. But first, the equation used to calculate them.
Drag Factor = ((100 - wRC+) * Plate Appearances) / Team Total Non-Pitcher Plate appearances
1) An individual's Drag Factor can be calculated with the equation above.
2) A team's Drag Factor (which is more useful) can be calculated by adding the Drag Factors of everyone on the team together.