I created a tool for planning your atlas gear leveling and organizing what gear you have. The tool is to assist with which primary and secondary shards, and the amounts of each, that are needed to level up your gear. It will also show you what that increase will get you in Attack/HP buffs.
The second and third tabs are simple pivot tables that generate a summary of your gear after it is entered. Hope this helps!!
P.S. This is only for elite and mythic gear.