Stair runner plan

A runner is measured as one long run, not step by step

Unlike tread covering bought and cut per step, a stair runner is typically one continuous strip that follows the stair's full profile: down each tread, over the nosing, and down each riser, tread after tread. This plan adds up that total length by multiplying your step count by the length each step contributes, then adds a fold allowance for the way the runner is installed.

Waterfall and French cap installs use length differently

A waterfall installation lets the runner fall straight down each riser without being tucked into the angle between tread and riser, which uses slightly less length per step but can show more wear at the fold over time. A French cap or hollywood installation tucks the runner into that angle for a tighter fit, using a bit more length per step. The fold allowance in this plan is a simple total buffer; increase it if your chosen installation style or stair depth needs more.

Runner width usually matches the roll it comes from

Most stair runners are sold at a fixed width and simply cut to the length a staircase needs, rather than being seamed together from narrower widths the way a wide floor might be. This plan treats the runner as a single continuous cut at its full width, which matches how nearly all runner products are actually installed.

Pad choice affects both feel and cost, but is bought separately

Some stair runner products come with backing built in and install directly onto the stair; others require a separate pad underneath for cushioning and to protect the runner from wear against the stair nosing. Check your specific product's installation instructions before assuming a pad is or is not needed, since this plan's quantity covers the runner material itself, not a separate pad purchase.

Buy the full quantity from one dye lot

A staircase presents every step to the eye at once, which makes a color or pattern shift between production runs far more noticeable than it would be on an open floor. Purchase the full roll length this plan calculates in a single order where possible, and confirm the dye lot or batch number matches across the purchase before installation begins.

Verify before you buy

• Confirm whether your stairs need a separate runner pad, since some runner products require one and others are backed for direct installation.
• Check the manufacturer's waterfall-versus-French-cap installation instructions, which change how much extra length is used per step.
• Verify the runner width you plan to buy actually matches your stair width and desired border margin on each side.