If the store also stocks 13½ or 15 ft rolls, switching width can remove a seam or a lot of waste for rooms just over 12 ft wide.
How the carpet calculator works
CarpetCalc works out both layouts. Strips running along one side are that side plus the trimming allowance long; the number of strips is the other side ÷ the roll width, rounded up. Linear feet = strips × strip length, carpet area = linear feet × roll width, and square yards = square feet ÷ 9. It keeps the layout with fewer linear feet (or fewer seams on a tie). Pad = floor area plus the extra you set; tack strip = perimeter − doorways. For stairs, each piece is tread + riser + wrap long, and as many pieces as fit side by side across the roll are cut from each row.
Carpet bought from a 12 ft roll (6″ trimming allowance)
| Room | Floor | Carpet bought | Seams |
|---|---|---|---|
| 10 × 12 ft | 13.33 sq yd | 14 sq yd (10.5 linear ft) | 0 |
| 12 × 12 ft | 16 sq yd | 16.67 sq yd (12.5 linear ft) | 0 |
| 12 × 15 ft | 20 sq yd | 20.67 sq yd (15.5 linear ft) | 0 |
| 12 × 18 ft | 24 sq yd | 24.67 sq yd (18.5 linear ft) | 0 |
| 14 × 16 ft | 24.89 sq yd | 38.67 sq yd (29 linear ft) | 1 |
| 16 × 20 ft | 35.56 sq yd | 44 sq yd (33 linear ft) | 1 |
Real layouts also depend on pile direction, pattern repeat, seam placement and how offcuts can fill closets and doorways, so a store or installer may plan the cuts differently. Patterned carpet needs extra for matching the repeat. Results are estimates: have the room measured before you order.
Frequently asked questions
How wide is a carpet roll?
Most broadloom carpet is 12 ft wide; some styles also come in 13½ or 15 ft widths.
How many linear feet for a 12 × 15 room?
One 12 ft wide strip about 15½ ft long, which is 186 sq ft or about 20.7 sq yd.
Which way should carpet seams run?
Ideally toward the main light source and away from heavy traffic, with the pile of every piece running the same way.
Is CarpetCalc free?
Yes, with no sign-up or ads.
Are my measurements saved?
Yes, in this browser only.