Carpet Calculator: Square Yards You Need
Convert your room area to square yards of carpet with a waste factor — because carpet is priced and sold by the square yard, not the square foot.
Calculator
A 180 sq ft room is 20.0 sq yd (9 sq ft = 1 sq yd); at 10% waste that’s about 22.0 sq yd. Carpet comes in 12 ft (and 15 ft) broadloom widths, so seam placement can add waste — confirm with your installer.
Carpet is the one flooring most often quoted by the square yard, which trips up a lot of homeowners working in square feet. This calculator converts your measured area to square yards (9 sq ft = 1 sq yard) and applies a waste factor so your order matches how the store prices it.
Carpet comes off a roll in fixed broadloom widths — usually 12 ft, sometimes 15 ft — so the practical waste depends heavily on how your room fits the roll width and where the seams fall. A room slightly wider than the roll can waste a surprising amount, which is why a professional measure and a seam plan matter. Use this as a planning figure, then confirm the exact yardage with your installer.
Formula
sq_yd = (area_sqft ÷ 9) × (1 + waste%)
Divide square feet by 9 to get square yards, then grow by the waste factor. The 9 is an exact identity (a square yard is 3 ft × 3 ft = 9 sq ft), so the only judgment call is the waste factor, which for carpet is driven by roll width and seams rather than cut pieces.
Worked example
A 180 sq ft room at a 10% waste factor:
- Square yards = 180 ÷ 9 = 20 sq yd
- With waste = 20 × (1 + 0.10) = 22 sq yd
So about 22 square yards of carpet. Remember that broadloom width can force more waste than the raw factor suggests: an 11 ft-wide room cut from a 12 ft roll leaves a 1 ft strip that may or may not be usable elsewhere. Price the installed job with the carpet installation cost calculator.
Broadloom width, seams and pad
Plan seams away from high-traffic paths and doorways, and run the pile in one consistent direction — both affect how much carpet you buy and how the finished floor looks. Stairs and landings add yardage and often their own seams, so measure them into the total. The cushion (pad) underneath is a separate line item in the installation cost, and cleaning down the road is priced by the carpet cleaning cost calculator.
This is a planning estimate: a professional measure accounts for roll width, seam layout and pattern match, and can differ from the raw conversion. Read carpet: square yards, seams & cleaning for the full walk-through.