How much carpet do I need to order? To determine the approximate quantity of carpet you will need, multiply the length (feet) of the room by its width (feet), and yardage. Add 10 percent to account for room irregularities. It is best to have your retailer or installer make final measurements, to ensure that you purchase the correct amount. As professionals, they know how to include hallways and closets, match patterns, plan seam placements, work with room irregularities, and account for rooms with widths greater than 12 feet. (Most carpet is produced in 12 foot widths). Unlike most of competition, we offer free measuring and estimates whether or not you decide to choose Rugs, Rolls and More as your flooring services. One of our custom flooring professionals will come to your home or office and measure each area that you need re-floored. If there are any questions, we will help choose the type floor that is the best fit for your wants, needs and budget.