Carpet Installation Cost Calculator

The average cost to carpet a standard 12×12 foot room (144 sq ft) ranges from $450 to $1,600 including materials, padding, and installation labor. Builder-grade carpet with standard padding costs approximately $3-4 per square foot installed, while mid-range carpet runs $5-7 and premium options reach $8-12 per square foot all-in. The exact price depends on carpet quality, padding type, whether old carpet needs removal, and local labor rates. Our calculator provides a detailed breakdown for your specific room dimensions.

To convert your room measurements to square yards, multiply the room length by width (both in feet) to get square feet, then divide by 9. For example, a 15×12 foot room is 180 square feet or 20 square yards. Carpet is traditionally sold by the square yard, though many retailers now price by the square foot. Add 10% to your calculated amount for cutting waste and seams. Carpet typically comes in 12-foot or 15-foot wide rolls, so room dimensions affect how much waste occurs.

For most residential applications, 7/16 inch thick padding with a density of 6-8 lbs is ideal. Thicker is not always better — padding that is too thick (over 1/2 inch) can cause carpet to flex excessively, leading to premature wear and wrinkles. For stairs, use firm, thin padding (3/8 inch, 8 lb density) for safety. For basements or concrete floors, use moisture-barrier padding to prevent mold. Premium 10 lb padding offers the best comfort and extends carpet life by 25-40% according to the Carpet and Rug Institute.

Professional carpet installation for a standard room (150-200 sq ft) typically takes 1-2 hours. A whole house (1,000-2,000 sq ft) usually requires 1-2 days. Add time for old carpet removal (about 15-30 minutes per room), furniture moving, and stair installation (20-30 minutes per stair). Complex layouts with many seams, closets, or irregular shapes take longer. Most installers prefer to have the home empty of furniture for the fastest, cleanest installation.

Big-box stores (Home Depot, Lowe's) offer competitive prices and convenient free measurement services. Specialty carpet dealers often carry higher-quality options, more selection, and experienced installers who handle complex layouts better. Wholesale carpet outlets and remnant dealers can offer 30-50% savings on name-brand carpet. For best results, get at least three quotes, compare the total installed price (not just material cost), and ask about warranty coverage for both the carpet and installation.

Nylon is the most durable carpet fiber for residential use, offering excellent resilience, stain resistance, and wear characteristics. Solution-dyed nylon (like Mohawk's SmartStrand or Shaw's Anso nylon) resists fading and bleach stains. Polyester (PET) is softer and more affordable but less resilient in high-traffic areas. Olefin (polypropylene) resists moisture and mold, making it suitable for basements. Wool is premium — naturally stain-resistant, extremely durable, and fire-retardant, but costs 2-3 times more than synthetic options.

Add 10-15% to your calculated square footage for waste due to cutting, seams, and pattern matching. Carpet comes in standard roll widths (usually 12 or 15 feet), so rooms wider than the roll width will have seams and additional waste. Patterned carpet requires extra material for pattern alignment at seams — add 15-20% for heavily patterned styles. For L-shaped rooms or homes with many small rooms, waste can reach 15-20% because carpet must be cut from rectangular rolls and cannot always be efficiently used from remnant pieces.

Yes, replacing padding when installing new carpet is strongly recommended and most professional installers require it. Old padding loses its cushioning and support over time, absorbs odors, and can harbor allergens, mold, and dust mites. New carpet installed on old padding will not feel or perform as well and may void the carpet manufacturer's warranty. The cost of new padding ($0.30-0.75 per sq ft) is a small fraction of the total project cost and significantly extends the life of your new carpet.

Quality carpet in a well-maintained home typically lasts 10-15 years. High-traffic areas like hallways and living rooms may show wear in 8-10 years, while bedrooms can look good for 15-20 years. Signs it's time to replace include matting that does not bounce back after cleaning, visible wear paths, persistent odors even after professional cleaning, stains that cannot be removed, wrinkles or buckling, and significant color fading. Regular vacuuming and professional cleaning every 12-18 months can significantly extend carpet life.