Free floor area calculator for any rectangular room. Enter length and width to get square feet, square yards, square meters, and perimeter.
Reviewed by Elena Vasquez, Flooring Installation Contractor · Last updated: May 2026
Closet carpet quotes still land in square yards at the desk even though you measured in feet at the rod. Punch inside dimensions here and you'll get sq ft, sq yd, and perimeter before you pick pad or tack strip. Waste and roll width breaks belong in the carpet material tool—this page is the raw rectangle only.
Square-yard quoting. Carpet dealers price rolls in sq yd—143 sq ft becomes 15.89 sq yd on the ticket, not 143.[1]
Inside wall rule. Measure where the pile meets the baseboard, not the door jamb outside the closet.
Bi-fold door swing. Include the full rectangle under the door stack—don't subtract the door footprint.
Shelf pole zone. Floor still gets carpet under fixed shelving unless you're leaving bare melamine.
Example: An 11 ft × 13 ft walk-in closet = 143 sq ft. For carpet prep: 143 ÷ 9 = 15.89 sq yd (dealers often round to 16 yd once you add pattern waste). Perimeter = 2 × (11 + 13) = 48 ft for tack strip layout—not deducting the door opening.
Area (sq ft) = Length × Width (in feet)
Square yards = Square feet ÷ 9
Square meters = Square feet × 0.092903
Perimeter (ft) = 2 × (Length + Width)
143 sq ft ÷ 9 = 15.89 sq yd. Add waste in your carpet calculator before you round up for the roll.
Roll goods are traditionally sold by the square yard in the U.S.—sq ft is fine for pad specs but the desk quote is usually yd.[2]
No for face area—you still cover the floor under the door swing. Deduct only if you're leaving that zone bare.
Not here—take sq yd forward to our flooring calculator or dealer worksheet with 10–15% for seams and pattern match.
Estimates are based on flooring industry standards. Actual quantities may vary by ±10% depending on room layout and measurement method. Always confirm with your supplier before ordering.