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We use LISP a lot here and find it great for automating actions in AutoCAD.  Below are a few of our most used for you to download and install. 

SAREA: (Sum Area) 
This LISP allows you to select multiple closed polygons and return the sum of all of the areas. Download it here for free.

ATM: (Area Text Meters) 
This LISP finds the area of a closed polygon and will insert a text entity with the area. Download it here. If you need the area in feet then download this one here for free.

TLEN: (Total Length) 
This LISP return the total length of all entities selected. Download it here for free.

AN: (Auto Number)
A LISP that will automatically increment number for you.  Great for numbering spaces and stair treads.  It asks for a prefix first, like room or office for example and then the starting number.  You can ignore the prefix and just put numbers in.  Download it here. for free.