Community member Photon Fury has put together a Shield Block Simulator calculator which is still currently in development.
The simulator will basically let you see how long your character would survive against a predetermined # of enemies without considering the fact that you would be killing mobs during the simulation. You can change the stats of your character, monster damage , passive skills and shield stats to evaluate the impact on the survivability of the character. For the most part I hope that it is self explanatory and I take “little” responsibility if there are bugs or inaccuracies. Its geared towards Barbarians but I’ve added some flexibility to allow it to be used for other character types. Feedback is welcome.
Do check this out and fire any further feedback into the thread for Photon Fury.
Don’t forget to pop into the Theorycrafting forum for help and to share your knowledge.