Square Footage Calculator (Rooms)
Add up the floor area of several rooms in square feet and square metres, with price per square foot, free online.
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List each room as "name: length x width" or just "length x width". The total area is shown in both square feet and square metres. Enter a price or rent to get the cost per square foot. Measure to the inside of the walls (carpet area) unless a listing says "gross" area.