By the Linear Feet Calculator Team|Reviewed by flooring installation professionals|Updated June 2026
Carpet is sold by the square foot but rolls are manufactured in standard widths — most commonly 12 feet. To order the right amount, you convert your room's square footage into linear feet of carpet roll. This calculator does exactly that.
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Linear Feet for Carpet
Calculate linear feet for carpet
Standard is 12 ft
Carpet Needed:
How Carpet Is Measured and Sold
Carpet is manufactured in rolls with a fixed width — 12 feet is the industry standard, though some styles come in 13.5-foot or 15-foot widths. Here's how the calculation works:
Linear Feet of Carpet = Room Square Footage / Roll Width (ft)
For example, a 240 sq ft living room with standard 12-foot-wide carpet: 240 / 12 = 20 linear feet of carpet needed. With a 10% waste factor, order 22 linear feet.
Why Roll Width Matters
A 15-foot-wide roll can cover a 14-foot-wide room in one piece with no seam. A 12-foot roll in the same room would need a filler strip and a seam. The wider roll costs more per square foot but may save on labor and waste. In tight spaces, a narrower roll can mean less waste.
Carpet Roll Widths by Type
Carpet Type
Standard Width
Waste Recommendation
Standard Cut Pile / Loop
12 feet
10% for rectangular rooms
Berber / Level Loop
12 feet
12% — seams are more visible
Patterned (Stripes, Plaids)
12 or 13.5 feet
15-20% for pattern matching
Commercial Broadloom
12 or 15 feet
10% for open-plan offices
Residential Wide Width
15 feet
8-10% — wider = less waste
Frequently Asked Questions
How do I convert square feet to linear feet for carpet?
Divide the room's total square footage by the carpet roll width in feet. Standard rolls are 12 feet wide, so a 240 sq ft room needs 240 / 12 = 20 linear feet. Then add 10-15% for pattern matching, seams, and odd shapes.
How wide is a standard roll of carpet?
Standard carpet rolls come in 12-foot widths. Some styles are also available in 13.5-foot and 15-foot widths for larger rooms. Berber and patterned carpets are commonly 12 feet. Always confirm the width with your retailer before calculating.
How much extra carpet should I order?
Add 10% for a simple rectangular room, 15% for rooms with closets or alcoves, and 20% for rooms with stairs or complex layouts. Patterned carpet (stripes, plaids) requires 15-20% extra for pattern matching at seams.
What about carpet for stairs?
Each step requires roughly 3 linear feet of carpet (including the tread, riser, and wrap). A standard staircase with 13 steps needs about 39 linear feet plus the landing area. Measure each stair individually for the most accurate estimate.