@sorrow
No, you don't have to guess. You just make a room with an outline that mimics the precise outline of the total area of your floor plan, and then SH3D will give you the areal of this outline. Then you can see what percentage you have to increase or decrease your outline with in order to match the areal on your floor plan. This should give you the correct size.
Or did I miss something...?
cec
... I have to make a wild guess as nothing that allows an auto gauge even if i have the total area in sqft
No, you don't have to guess. You just make a room with an outline that mimics the precise outline of the total area of your floor plan, and then SH3D will give you the areal of this outline. Then you can see what percentage you have to increase or decrease your outline with in order to match the areal on your floor plan. This should give you the correct size.
Or did I miss something...?
cec
Hi Ceciliabr, haha let me try first as i just started using this software, abit of virgin on this haha. like i mentioned in my earlier posts, please do pardon me if i asks 'strange' questions
or if i dun understand your question. let me have a look later when i'm back from work 
