Well, if you are squatting and deadlifting the calves should not be a problem. If you aren't, you can either do calf raises on the smith machine or dumbell step ups on a small platform o.e. just let your heels hang over the edge.
Calves are a difficult area to grow, much of it is genetic they are used a huge amount in the normal course of the day. I believe that higher rep ranges often work best if you are having trouble as the calf is mostly slow twich fibres - try 15-20 reps instead of what you are using and see how you go.