How this calculator works
Carpet is priced by the square yard. The calculator finds your room’s square footage, adds 10% for trimming and seams, then divides by 9 to convert to square yards.
Worked example — a 15 ft × 12 ft room:
180 sq ft × 1.10 = 198 ÷ 9 = 22 square yards.
180 sq ft × 1.10 = 198 ÷ 9 = 22 square yards.
Mind the roll width
Carpet usually comes in 12 ft wide rolls. Rooms wider than 12 ft need a seam, which adds a little waste — the 10% allowance covers most cases.
Frequently asked questions
How do I convert square feet to square yards?
Divide the square footage by 9 (a square yard is 3 ft × 3 ft).
How much extra carpet should I order?
About 10% for cuts and seams; more for stairs or oddly shaped rooms.