This is a tool I built when I was working on large projects in Minecraft. If for some reason you want to fill a 64x64 cube completely with cobblestone so there is no empty space inside and you need to know how many full shulker boxes it would take to get 4096 cobblestone blocks than this is the tool for you.

Stack Converter

Items
Stack Size
Stacks
Blocks
Chests
Double Chests

Nether Coordinate Converter

Overworld
Nether