Average Price Range of Carpet. Wall to wall carpet, on average, ranges in price from about $3-$7 per square foot. The higher the costs, the better the carpet usually is.An average carpet price is about $4.50 per square foot. Rugs can cost as little as $1 per square foot for very cheap products.A good-quality area rug will cost $5 or more per square foot with the best rugs crafted from materials such as wool costing more than $8 per square foot.verage Price Range of Carpet. Wall to wall carpet, on average, ranges in price from about $3-$7 per square foot. The higher the costs, the better the carpet usually is.