Webget the dimensions of rectangular acreage. Type acres and one side into the box. Web1 acre = 1/640th of a square mile. As an example, your land could have a length of 208 feet and a width of 209 feet, giving a total area of 43,472 square feet,. Webcalculate square feet, meters, yards and acres for flooring, carpet, or tiling projects. Enter measurements in us or metric units. How to calculate square footage for.