Free Carpet Calculator — Sq Yards, Pad & Cost (2026)

How to Use This Calculator

1. 1Measure your room length and width in feet.
2. 2Select the carpet roll width (12 ft is standard, 15 ft is also common).
3. 3Click Calculate to get square yards of carpet and pad needed.
4. 4Note the number of strips — each seam may need seam tape.

About This Material

Carpet is sold by the square yard (9 sq ft) and comes in rolls that are typically 12 or 15 feet wide. The most common fiber types are nylon (most durable, $3–$8/sq ft), polyester (soft and stain-resistant, $2–$6/sq ft), olefin/polypropylene (budget-friendly, $1–$4/sq ft), and wool (premium, $8–$20/sq ft). Carpet pad is essential and adds $0.50–$1.50 per square foot — an 8 lb, 7/16-inch thick pad is the minimum for residential use, while higher-density pads extend carpet life. Total installed carpet costs range from $3 to $12 per square foot including pad and labor. Carpet seams should run perpendicular to windows to minimize visibility. For stairs, add 1.5 linear feet per step for proper tucking. Commercial carpet tiles (typically 24x24 inches) are an alternative that eliminates waste from roll cuts and allows easy replacement of damaged sections. Most residential carpet carries a 10–25 year warranty depending on fiber type and construction.

Installation Tips

• •Always install carpet pad before carpet — it extends carpet life by 50% or more.
• •Run seams perpendicular to the main light source (windows) to hide them.
• •Stretch carpet properly with a power stretcher, not just a knee kicker, to prevent buckling.
• •Use tackless strips around the perimeter, set 1/2 inch from the wall.
• •Leave carpet and pad in the room for 24 hours before installation to acclimate.

Common Mistakes to Avoid

• ⚠Using a knee kicker only — power stretching is required for proper installation.
• ⚠Choosing too thin a carpet pad — 7/16 inch, 8 lb density is the minimum.
• ⚠Not accounting for pattern matching — patterned carpet requires 10–20% extra.
• ⚠Running seams parallel to windows where light highlights the joint.
• ⚠Forgetting to add carpet for closets, hallways, and stairs.

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