They say to use 10% less pellets than whole hops. Meaning if your recipe calls for 1 oz pellets, then you would use 1.11 oz whole leafs.
But be careful for bittering. It's hard to determine how much to use for bittering because you don't know the alpha acid percentage. It shouldn't make a crazy difference, but if you are going for a perfect clone recipe, then it might be a little off.
Personally I would dump them all in for your flavoring and aroma additions