Stair Carpet Calculator Guide

Estimate stair carpet or runner length from tread, riser, width, landing, and waste.

Measure each stair

Measure tread depth and riser height. Add them together for carpet length per step.

Multiply the per-step length by the number of stairs, then add landings separately.

A runner covers only part of the stair width. Full carpet covers the entire stair width.

Add extra for wrapping, pattern matching, nosing, and trimming.

Do landings count separately?

Yes. Measure landings like small rooms and add them to the stair estimate.

Does pattern direction matter?

Yes. Patterned carpet can need extra material to align correctly.

Should I include padding?

Padding is measured separately and should match the installation method.

Open the calculators and enter your dimensions to estimate materials before you shop.