Stroke with only Pistons and Crank?

If the rod length is stock then the pistons must be longer to get the full stroke correct? If this is the case how do I calculate/determine the stroker piston length? I have yet to determine the actual stoke as this is the preliminary fact finding stages.

Stroker pistons have a lower compression height. The piston is actually shorter, the pin closer to the deck.

Lots of stroker pistons available. Biggest choice is dished or flat, lower compression (dished) or high (flat). The choice will depend on how much cam you want to run and what you intend to do with the car.