For an L-shaped room, split it into rectangles and run the calculator for each, or ask the store to plan the seams for the whole area.
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
Should I measure into doorways?
Yes, to the middle of the door, where the transition strip will sit.
Do I add extra when measuring?
Round up to the next inch; CarpetCalc adds the trimming allowance to each strip for you.
Do I measure closets separately?
Yes. Small closets can often be covered from the offcut of the main room.
Is CarpetCalc free?
Yes, with no sign-up or ads.
Are my measurements saved?
Yes, in this browser only.