Can you explain IsoP to me? Thanks IsoP = SLG - AVG Basically a ratio extra bases per at bat. For example, if a guy goes 11 for 30 with 3 doubles, then he'll have a .367 AVG and a .467 SLG. If another guy goes 8 for 30 with 3 doubles and a home run, he'll have a .267 AVG and a .467 SLG. Even though it's obvious the second player hit for more power, they have identical SLG. However, if you look at IsoP, you can see the first player (.100 IsoP) is less powerful than the second (.200).