Matching a Room Measured in Feet to Carpet Priced by the Yard
You measure a bedroom with a tape in feet and inches, write down 12 by 14, and then the showroom tag says $34 a square yard. Underlay is quoted the same way, and so is the fitter's labour. Nothing about broadloom carpet is sold in the units the room was measured in, so the first job of any carpet estimate is moving the floor area from square feet to square yards — and the second is admitting that a 12-foot roll will not give you exactly that.
Why Soft Flooring Kept the Yard
Broadloom is priced by the yard
Rolls come in fixed widths
Pad follows the carpet
Labour is quoted the same way
Working Out an Order Before You Call the Retailer
Do the arithmetic on the finished floor first, then let the roll width tell you what you must actually buy.
Enter the room's square footage
Multiply length by width in feet — a 11 × 14 ft living room is 154 — and type that into the left field. Decimals are fine for part-feet, and a comma is accepted in place of a point.
Redo it at the roll width
Take the room dimension that runs across the roll, round it up to the 12 ft width, and convert again. That 11 × 14 room really consumes 12 × 14 = 168 ft², so you buy 18.67 yd² and trim 14 ft² away.
Check a yardage quote back into feet
When the retailer answers with "you need 22 square yards", press the swap button (↔) to run yd² → ft² and confirm it against your room: 22 yd² is 198 ft², which is more floor than a 12 × 14 bedroom has.
Copy the yardage onto the order form
The copy button on each field gives the plain number, no unit and no thousands spacing, ready to paste into a quote request or a pricing sheet. Ctrl + C in the field does the same thing.
Room Areas, Square Yards and What a 12 ft Roll Costs You
Each row shows the finished floor, its yardage, and the carpet that has to be cut from a 12-foot-wide roll to cover it. The last column is the difference between the two — the part you pay for and then throw away.
| Room or piece | Floor area | Finished yd² | Cut from a 12 ft roll | Ordered yd² |
|---|---|---|---|---|
| Bedroom 10 × 12 ft | 120 ft² | 13.33 yd² | One 10 ft drop | 13.33 yd² (no waste) |
| Bedroom 12 × 14 ft | 168 ft² | 18.67 yd² | One 14 ft drop | 18.67 yd² (no waste) |
| Living room 11 × 14 ft | 154 ft² | 17.11 yd² | One 14 ft drop | 18.67 yd² (+9 %) |
| Living/dining 14 × 18 ft | 252 ft² | 28.00 yd² | Two 14 ft drops, seamed | 37.33 yd² (+33 %) |
| Straight stair, 13 steps 36 in wide | 56.9 ft² | 6.32 yd² | Cut in strips across the roll | 13 yd² at the usual 1 yd²/step |
| Bound area rug 8 × 10 ft | 80 ft² | 8.89 yd² | One 10 ft drop, trimmed to 8 ft | 13.33 yd² (+50 %) |
The first two rows are the happy case: rooms whose short dimension is 12 feet or less waste nothing, because one drop of the roll covers them. Everything else pays a width penalty. The 14 × 18 room is the classic trap — 28 yd² of floor needs 37.33 yd² of carpet and a seam, and turning the layout so the 18-foot dimension runs along the roll instead is what keeps that figure down rather than pushing it toward 48.
What Makes the Estimate Quicker
Room after room, live
Both fields update as you type, so a whole house — 120, 154, 252 — can be run in one sitting while you note each yardage against the room name.
Audit the retailer's yardage
The swap button flips to yd² → ft², which is how you test whether a quoted yardage matches the floor you actually measured or quietly includes waste.
Clean figures for the order form
Results carry up to eight decimals and copy without unit or spacing, so a repeating value like 17.111111 pastes into a pricing sheet exactly as calculated.
Metric widths when the roll is imported
The searchable dropdowns hold every area unit, so a European broadloom quoted per square meter on a 4 m roll can be brought onto the same page for comparison.
Carpet and Underlay Ordering Questions
Why is carpet still sold by the square yard in the US?
It follows the loom. When mills settled on a 12-foot roll, a linear yard of that roll was 12 × 3 = 36 ft², or exactly 4 square yards, which made pricing and cutting simple arithmetic on the shop floor. Some retailers now advertise a per-square-foot price to look cheaper next to tile and vinyl; multiply it by 9 before you compare it with anyone quoting yards.
How much extra should I allow for the 12 ft roll width?
It depends entirely on the room, not on a flat percentage. A room 12 feet or less across wastes nothing; an 11-foot room throws away a one-foot strip for its whole length, about 9 %; anything over 12 feet wide needs a second drop and a seam, which is where 30 % and more appears. Add roughly 10 % on top for trimming, and 5–10 % again if the carpet has a pattern that must line up across a seam.
How do I compare a price per square yard with a price per square foot?
Divide the yard price by 9 to get the foot price: $36/yd² is $4/ft², and $45/yd² is $5/ft². Going the other way, $3.50/ft² is $31.50/yd². Check what each quote covers as well — a yard price often bundles pad and fitting, while a per-square-foot shelf price is usually the carpet alone.
Is underlay ordered in the same square yards as the carpet?
Same unit, usually a smaller quantity. Pad is priced per square yard too, but it comes in narrower rolls and offcuts can be butted together anywhere, so you buy close to the finished floor area — 17.11 yd² for that 154 ft² living room rather than the 18.67 yd² of carpet. Order it to the room, add a little for trimming, and remember many manufacturer warranties tie the carpet to a minimum pad density.
How much carpet does a staircase take?
Far more than the visible surface suggests. A 36-inch step with a 10-inch tread and a 7.5-inch riser shows about 4.4 ft², so thirteen steps are only 56.9 ft² — 6.32 yd². Fitters still allow about one square yard per step, roughly double, because every strip must be cut with the pile running the same way down the flight and a winder or a bullnose eats more again.
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