Carpet Calculator

Calculate exactly how many square yards of carpet you need plus padding and installation cost — supports 12-ft and 15-ft roll widths.

Rooms

Name

L (ft)

W (ft)

Carpet Options

Roll Width

Waste Factor (%)

Carpet Cost ($/sq ft)Range: $2–$8 (mid: $5)

Padding ($/sq ft)Range: $0.30–$1.00

Installation ($/sq ft)Range: $0.50–$2.00

Include padding

Include installation

Square Yards Needed

22.0 yd²

198 sq ft (with 10% waste)

Room Floor Area

180 ft²

20.0 yd² actual

Roll Coverage

180 ft²

After roll-width adjustment

Carpet Cost

$990

198 ft² × $5

Padding Cost

$99

180 ft² × $1

Installation Cost

$225

180 ft² × $1

Total Project Cost

$1,314

$7/sq ft

Tip

If your shorter room dimension exceeds 12 feet, plan for at least one seam — or upgrade to a 15-foot roll for an extra 10–20% to eliminate it.

How to Calculate Carpet for Any Room

The basic formula is (room length × width × 1.10 waste) ÷ 9 = square yards needed. For a 15 by 12 foot living room, the math works out to (15 × 12 × 1.10) ÷ 9 = 22 square yards. The complication is that carpet ships in fixed roll widths — almost always 12 feet, occasionally 15 feet — and any room dimension that exceeds the roll width forces a seam, which adds material because each cut piece must be the full width of the roll.

For a 14 by 12 foot bedroom, a 12-foot roll requires two strips (one 14 feet by 12 feet plus a 14 foot by 2 foot fill strip), which means buying 14 × 14 = 196 square feet rather than the actual 168 square feet. That is why our calculator includes a roll-width adjustment: it computes both the raw floor area and the actual purchase quantity after factoring in roll width and seams.

Padding is calculated on raw floor area, not roll-adjusted area, because pad scraps can be pieced together without seams showing through. Most homeowners use 1/2-inch thick rebond padding at 6 to 8 pounds per cubic foot density. Premium memory foam and rubber pads cost twice as much but extend carpet life noticeably in heavy-traffic areas.

Carpet Cost in 2026

HomeAdvisor 2025 True Cost Report data shows installed carpet pricing remained relatively stable from 2024 to 2026 after the post-pandemic price corrections. Here are typical 2026 ranges:

Carpet Grade	Material / sq ft	Lifespan
Builder-grade polyester	$2 – $4	5–8 years
Mid-grade nylon	$3 – $6	8–12 years
Premium nylon	$5 – $8	12–18 years
Wool / wool blend	$8 – $14	15–25 years
Berber (looped)	$3 – $7	10–15 years
Indoor/outdoor	$2 – $5	8–15 years

Padding adds $0.30 to $1.00 per square foot (6-lb rebond at the low end, premium memory foam at the high end). Professional installation runs $0.50 to $2.00 per square foot, with the high end reserved for stairs, complex layouts, and pattern-match work. Stair carpeting is billed per stair tread ($15 to $40 each) on top of the per-square-foot rate.

Common Carpet Mistakes

Reusing old padding. Voids carpet warranties and produces visible compression patterns within months. Always replace padding with new carpet.
Skipping the moisture test. Concrete subfloors must test below 3 lbs/1000 sq ft / 24 hr moisture vapor emission. High moisture grows mold under padding within weeks.
Pattern not aligned at seams. Berber and patterned carpet must be installed with carefully matched seams. Order 5 to 10 percent extra material specifically for pattern matching.
Ignoring traffic patterns when choosing fiber. Polyester resists stains but mats in walkways. Nylon springs back. Choose fiber based on traffic, not just price.
Underestimating waste on stairs. Carpeting a flight of stairs requires 2 to 3 square yards per 4 feet of stair run with proper waterfall or wraparound install.

Carpet Industry Statistics 2026

$11.5B

U.S. residential carpet market 2025 — second-largest soft surface category, but flat YoY as LVP continues to take share (Catalina Research, 2025)

$2,400

average installed cost for 500 sq ft of mid-grade nylon carpet with padding — bedroom or master suite project (HomeAdvisor, 2025)

10%

average material waste on carpet projects — accurate measurement saves $80–$300 per room (Carpet and Rug Institute, 2024)

Carpet remains the preferred floor covering for bedrooms in 78 percent of U.S. homes, despite hard-surface flooring dominating other rooms (NAHB Builders 2025 Survey). Pair this calculator with our flooring calculator for hard-surface comparisons, our insulation calculator for sound and thermal insulation under flooring, or our drywall calculator for full bedroom renovation. To finance a carpet replacement project, explore options at Amortio.

Frequently Asked Questions

How is carpet sold — by the square foot or square yard?

Most U.S. carpet retailers price carpet by the square yard, while flooring stores increasingly post per-square-foot prices for easier comparison with hard flooring. One square yard equals 9 square feet. To convert, divide square feet by 9 to get square yards. Carpet padding is typically priced per square foot. Always confirm the unit on a quote — a $30 per square yard carpet costs $3.33 per square foot.

What is the standard width of a carpet roll?

Almost all residential carpet in North America is manufactured in 12-foot wide rolls, which fits most rooms with a single seam. A small selection of patterns and commercial-grade carpet comes in 15-foot widths for larger rooms. Wider rolls reduce or eliminate seams but cost 10 to 20 percent more per square yard and have fewer style options.

How much extra carpet should I buy for waste?

Plan on 10 percent waste for simple rectangular rooms with one seam, and up to 15 to 20 percent for L-shaped rooms, multiple seams, or rooms wider than the roll width. Pattern-match carpets (Berber with linear pattern, geometric prints) require an extra 5 to 10 percent on top of that to align the design across seams. Our calculator defaults to 10 percent and lets you increase it for complex layouts.

How much does carpet cost in 2026?

Carpet material costs in 2026 average $2 to $4 per square foot for builder-grade polyester, $3 to $6 for nylon mid-grade, $5 to $8 for premium nylon and wool blends, and $8 to $14 per square foot for pure wool. Padding adds $0.30 to $1.00 per square foot depending on density (6 to 8 lb is standard residential). Professional installation runs $0.50 to $2.00 per square foot, typically billed per square yard.

Do I need new padding when replacing carpet?

Yes for almost all situations. Padding compresses over time and loses its springiness even when the carpet above is replaced. Reusing old padding voids most carpet warranties. Standard residential padding is 1/2-inch thick, 6 to 8 pounds per cubic foot. Bedroom and living room carpet should use 8-pound padding; basements and high-traffic areas benefit from rebond pad with a moisture barrier.

Are transition strips included in installation?

Most installation quotes include basic metal or vinyl transitions where carpet meets hard flooring (typically $5 to $15 per linear foot). Hardwood-to-carpet thresholds, T-moldings, and reducer strips for floors at different heights add $10 to $30 per linear foot when wood-veneered transitions are required. Always ask the installer to itemize transitions on the contract.

How long does carpet last?

Carpet lifespan ranges from 5 years for builder-grade polyester in heavy-traffic areas to 25 years for well-maintained wool in low-traffic master bedrooms. Mid-grade nylon typically lasts 8 to 12 years before showing visible wear in walkways. Annual professional cleaning extends life by 30 to 50 percent. Replace when matting in walkways, persistent stains, or strong odors no longer respond to deep cleaning.

Can I install carpet myself?

Carpet installation is one of the more difficult DIY flooring projects because it requires specialized tools (knee kicker $40 rental, power stretcher $50 rental, seaming iron $25 rental, carpet cutter, tackless strip nailer) and skill at making invisible seams. Most homeowners save $0.50 to $1.50 per square foot doing the demo and tackless strip work themselves but hire pros for the actual carpet stretch. Full DIY install is realistic only for square rooms with no seams.