Well, Blender is no cad software. And neither is Bforartists.
There is a measure tool in the tool shelf. And there is the grid. And there is of course the transform panel. In Object mode it tells you the dimensions of your object.
But when you are in edit mode then there is no Blender way to know how big a element really is.
We have in Bforartists a tool called Set Dimensions in the transform submenu of the mesh menu. With this tool you can see and set the world dimensions of a selection.
Hope this helps 🙂
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