Construction

Instant, private, and free

Carpet Calculator.

Estimate carpet strips, linear length, and area with explicit waste.

On-device calculationNo signup
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Set your values

Results update as you type.

Carpet strips: 2

Carpet strips

0.000
Linear length: 40

Linear length

0.000
Room area: 300

Room area

0.000
Purchased area: 528

Purchased area

0.000
wastePercent: 10

wastePercent

0.000

Use Cases

Planning carpet purchase for a room

Determine how much carpet to buy by entering room dimensions, roll width, and waste percentage. This helps avoid underordering or overordering.

Example: A 12x15 ft room with 12 ft roll width and 10% waste yields 3 strips and 49.5 linear ft.

Estimating cost for a flooring project

Use the calculated area and linear length to get quotes from suppliers or contractors, ensuring you have enough material for installation.

Example: For a 10x12 ft room with 5% waste, the area is 126 sq ft, helping you budget for carpet and installation.

Frequently Asked Questions

How does the carpet calculator determine the number of strips?
The calculator divides the room width by the roll width and rounds up to the nearest whole number. This gives the minimum number of carpet strips needed to cover the room width, assuming the roll runs along the room length.
What is linear length and how is it calculated?
Linear length is the total length of carpet you need to purchase, measured along the roll. It is calculated by multiplying the number of strips by the room length, then adding the waste percentage to account for cuts, seams, and pattern matching.
How does the waste percentage affect the estimate?
The waste percentage adds extra material to the linear length and area. For example, 10% waste means you order 10% more carpet than the exact room dimensions, helping to cover mistakes, irregular shapes, or pattern alignment.

Tips & Common Mistakes

Tips

  • Measure the room length and width at the longest and widest points, accounting for doorways and alcoves.
  • Choose a roll width that matches your room width to minimize waste and reduce the number of seams.
  • Add extra waste (10-15%) for patterned carpets or rooms with irregular shapes to ensure pattern matching.
  • Double-check your measurements and waste percentage before ordering to avoid costly mistakes.

Common Mistakes to Avoid

  • Forgetting to include waste percentage, leading to insufficient carpet for cuts and seams.
  • Using room dimensions in feet but roll width in yards without converting units, causing incorrect strip count.
  • Rounding down the number of strips instead of up, resulting in a carpet that is too narrow to cover the room.

Last updated: August 13, 2026