Stair Carpet Calculator

With 36 in width, 10 in tread, 7.5 in riser, and 15% waste: (10+7.5) x 36/144 x 14 x 1.15 = 70.4 sq ft / 9 = 7.8, so 8 square yards.

Use 15% as a minimum. If you have a patterned carpet that requires matching at each stair, use 20-25%.

IRC requires risers between 4 and 7.75 inches and treads at least 10 inches deep. Most homes use 7-7.5 in risers and 10-11 in treads.

Any carpet can technically go on stairs, but loop piles (Berber) can snag and are not recommended. Cut-pile and textured cut-pile are best for stair durability and safety.

Carpet is priced per square yard but you can buy it in any quantity. Most rolls are 12 ft wide. A square yard = 9 sq ft. Always add 10-15% for waste and pattern matching on stairs.

Yes. Use a dense pad rated at least 8 lb density for stairs. Soft, thick pads compress under foot traffic on the nose and can become a trip hazard. Waffle pads are not suitable for stairs.

Measure the runner width you want (typically 27-36 in), not the full stair width. Multiply runner width by the total length of one full stair measurement (tread + riser) times the number of stairs, then add 15-20% waste.