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That roll of carpet has the square yardage of its width measured in yards multiplied by its length measured in yards.
You may need to unroll it to find the length exactly, or if you are only looking for an approximate area and hence length, you can assume the roll is made up of concentric rings of carpet, measure the diameter of each ring from the inside to the outside (to the backing of the carpet) and use these find the circumference of each ring and sum them - this sum can be calculated by summing the diameters and multiplying that sum by π. The last ring will not usually not be a full ring, so it can either be measured directly or added in as a fraction of the whole ring multiplied by its diameter.
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How many square yards of carpet are needed to cover a floor that is 9 feet by 10 feet?
10 square yards. Note, the amount of carpet you have to pay for may actually be more than 10 square yards as you will have to buy the entire width of the roll * the length you need. Assuming it is 12' wide you would need 12 square yards and if its 15' wide you would need 15 yards. No carpet store sells carpet by what you need but only by what the width of the roll is. So if you need a 10 x 9 piece, the carpet only comes 12 foot wide so you would take home a piece of carpet 12 x 9.
How many square feet are in this roll of carpet?
This will vary by brand and style carpet.
How many square yards are on a roll of carpet padding?
This varies based on the type of padding and the manufacturer. Most tend to range from 20-40 sq yds.
How many yards are in a 12 ft roll of carpet?
This varies greatly. Usually more then 100 sq yards, but less then 200 sq yards.
How many feet are in 400 square yards of carpet or how large would the roll be?
The roll would have 3600 sq ft of carpet. It is very uncommon to see a roll this large unless it is a thin indoor/outdoor...but even for those that is large. A roll this size would be too large for anyone to move without a carpet pole on a truck. Most mills will not ship carpet larger then about 133.33 sq yards. They will ask you to request cut sizes. Just verify these are coming from 1 dye lot. As to how big the roll would be would depend on the thickness of the carpet. It would be over 4 ft wide easily and with an average plush closer to 5 ft wide.
