Carpet Calculator — ft to sq yd, rolls, cost
How to use this calculator
Enter room dimensions (rectangle, L-shape, or custom area). Select carpet roll width (12 ft or 15 ft standard). The calculator determines the linear feet of carpet off the roll, number of seams, padding area, and tack strip perimeter. Waste is calculated based on seam matching.
Roll widths — 12 ft (standard) or 15 ft. Wider rolls reduce seams.
Padding — same area as carpet. Tack strips run the room perimeter minus doorways.
Saved Calculations
| Time | Shape | Area ft² | Sq Yd | Roll ft | Seams | Cost |
|---|
How to Calculate Carpet for a Room
This carpet calculator estimates the square yards of carpet needed, linear feet off the roll, number of seams, padding area, and tack strip quantity. Enter room dimensions in feet and inches, choose your roll width (12 ft standard or 15 ft wide), and adjust waste allowance.
Formulas
Square yards = (length × width) / 9. Linear feet = room length × ceil(room width / roll width). Seams = ceil(room width / roll width) − 1. Tack strips = perimeter / 4 (sold in 4 ft pieces). Padding = same area as carpet.
Roll Width Tips
Standard carpet rolls are 12 ft wide. If your room is 12 ft or narrower, you avoid seams entirely. 15 ft wide rolls cover wider rooms seamlessly. Always run carpet lengthwise along the longest dimension for fewer seams.
FAQ
Why sq yd instead of sq ft? Carpet is traditionally priced and sold by the square yard in the US. 1 sq yd = 9 sq ft. Do I need extra for pattern matching? Yes, add 10-15% waste for patterned carpet to align the pattern across seams.
