Free Calculator · By SubcontractorHub Editorial Team · Published November 2026
Carpet Calculator for Square Yards Off the Roll
A carpet calculator on this page lays strips across the roll width you type and keeps the direction that buys less. A 12 by 15 foot room on a 12 foot roll is 20 square yards to buy, which matches the floor. No price is printed.
Built by SubcontractorHub — the software contractors use to quote, finance, and run every job.
Book a DemoHow the Carpet Calculator Cuts the Roll
Full-width strips. The smaller of the two directions.
12 by 15 feet and a 12 foot roll are the numbers in the boxes. They are not a mill standard. Extra starts at zero.
The floor is 180.0 square feet, or 20.00 square yards. The smaller layout runs along the width: 1 strip, 180.0 square feet to buy, which is 20.00 square yards. Seams: 0.
All calculations are estimates based on historical information and should be verified by the user.
Important: the roll width is typed
All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.
This Carpet Calculator Is Not a Square-Yard Conversion
Dividing the floor by 9 is the square yard calculator. That page does not decide which way the roll runs. This carpet calculator does. When the room is wider than the roll, you buy the unused edge of the last strip, so the order can be larger than the floor.
Plank flooring sold by the carton is the laminate flooring calculator. Tile counted by the piece is the tile calculator. A room measured only in square feet, with no roll, is the square footage calculator.
Worked room
Length 12 feet. Width 15 feet. Roll 12 feet. Extra 0. The floor is 180 square feet, or 20 square yards. One strip along the 15 foot side covers it, so the carpet calculator buys 20 square yards and shows 0 seams. Turn the strips the other way and you buy more. The page keeps the smaller one.
| Line | Rule | Example |
|---|---|---|
| Floor | length × width ÷ 9 | 20 sq yd |
| Strips | across ÷ roll, rounded up | 1 |
| To buy | strips × length × roll ÷ 9 | 20 sq yd |
| Seams | strips − 1 | 0 |
How should you order from the carpet calculator?
- Each room at its longest and widest, in feet, including the doorway if the carpet runs through.
- The roll width on the product you will buy, in feet. Do not leave the example if the roll is different.
- Extra inches per strip only if the seller asked for trim or a pattern match.
- Read square yards to buy, not only the floor, when the last strip does not fill the roll.
- Seam count is strips minus one. It is not a promise of where the seam lands.
- No pad, no stairs, and no price on this page.
What the Carpet Calculator Leaves Out
Closets, stairs, and a pattern repeat change a real cut. This page is one rectangle. Add another pass for a second room, because leftovers are not carried over. Pile direction can force the longer layout even when it buys more carpet. If the installer says so, use that direction and ignore the smaller number.
A public search for a carpet calculator returned layout tools that assume a 12 foot roll and sometimes a price. No mill page was fetched for a standard width, and no price was copied. Twelve feet stays an input. Square yards are the unit because a square yard is 3 feet by 3 feet.
Frequently Asked Questions
How does the carpet calculator get square yards?
It divides the carpet you would buy by 9. A 12 by 15 foot room on a 12 foot roll, with no trim allowance, buys 180 square feet, which is 20 square yards, in one strip. The other direction needs two strips and more carpet, so the page keeps the smaller layout.
Is 12 feet a required roll width?
No. Twelve feet is the number in the example box. No mill width was fetched. Type the roll you are actually buying.
Does this carpet calculator price the job?
No. It does not print a price per square yard. The square yard calculator converts area and also does not price carpet. Pad and stairs are not on this page.
Why can the order be larger than the floor?
Strips are the full roll width. If the room is wider than the roll, you buy the leftover edge of the last strip. Pattern match and stairs are extra and are not added unless you type an allowance in inches.
Measure the Room, Then Price the Yard Elsewhere
Square yards are the cut. Dollars are the supplier.
Get a Free DemoAll calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.