Editing MathHammer (section)

==Points per Wound==
To calculate the effectiveness of a given unit you can divide the average damage output by the cost of the unit. 10 Chaos Space Marines cost 130 pts, so each unsaved wound in close combat costs you 130/6.09=21.35 pts. 

You can go one step further and divide it by the cost of a wound on a model that you are killing. 10 Guardsmen cost 40 pts so 1 is 40/10=4 pts, 21.35/4=5.34.

Now you can compare the squad to other units available to you, 5 Khorne Berzerkers for example pay 7.91 pts per unsaved wound they cause assuming they don't lose any models when the Guardsmen strike back before they can fight a second time. That means Khorne Berzerkers with chainaxes are 2,69 times as effective at killing Infantry Squads in melee compared to a Chaos Space Marine unit with chainswords. For this reason and because attacking twice also gives a lot of tactical flexibility Chaos Space Marines with chainswords are never used, on the other hand Khorne Berzerkers get used a lot more relative to the Chaos Space Marines. You also need to factor in how vulnerable a unit is, in this case Khorne Berzerkers pay 30% more per wound, but if you are paying for a Rhino to transport and protect your melee unit, suddenly you are paying very little extra to have Khorne Berzerkers instead of Chaos Space Marines and the durability issue is mitigated by the Rhino.