How much runner do 15 steps need?

Use the figures below to check a 15-step estimate. They assume equal covered steps and no landing or nosing allowance unless stated.

With a 10 in tread and a 7.5 in riser, 15 steps need 262.5 in: 21 ft 10.5 in, or 6.67 m.

Your staircase

Optional starting measurements

Example measurements only, not building-code advice. Replace them with measurements from your own stairs.

Check a few steps before using one set of measurements for the whole flight.

Number of stairs

Count the tread-and-riser pairs the runner will cover. Exclude landings.

Tread depth (in)

Measure the runner path across the flat tread. Fractions like 10 1/2 work.

Riser height (in)

The vertical face between two treads.

Waste allowance

Custom%

10% is the starting allowance here, not a guarantee. Ask your fitter about patterns and turns.

Add a nosing / overhang allowance per step

Enter the extra runner path around the edge, including any underside wrap. Do not add it twice if it is already included in your measurements.

Your runner estimate

20 ft 3.1 in

Total runner required for 13 steps, including a 10% waste allowance.

Total runner length in each unit
Inches	243.1 in
Feet	20.26 ft
Feet & inches	20 ft 3.1 in
Yards	6.75 yd
Meters	6.17 m
Centimeters	617.47 cm

Length to order

21 ft

7 yd · 6.4 m · 252 in

This calculator provides an estimate based on the measurements and installation assumptions you enter. Complex, curved or winder staircases may require professional measurement.

One step, shown in profile

Side elevation of a staircase. The runner travels across each tread and down each riser, so every step consumes tread depth plus riser height of material.

The 15 step numbers

Bare 262.5 in. Plus 10% waste: 288.8 in (24 ft 1 in). Add a 1 in nosing allowance per step and it rises to 277.5 in bare, 305.3 in ordered.

Nosing matters more on long flights

A one inch nosing wrap costs 15 in across a 15 step flight — more than a whole extra step. If your treads have a pronounced bullnose and you are fitting waterfall style, include the allowance.

Deeper treads change everything

Swap the 10 in tread for an 11 in tread and the same 15 steps need 277.5 in bare. Always measure rather than assuming.

Questions people ask

How much stair runner for 15 steps?: With 10 in treads and 7.5 in risers, 15 equal covered steps need 262.5 in. With 10% waste that is 288.75 in (24 ft 0.75 in), before supplier rounding and with no landing or nosing allowance.
Should I add nosing allowance?: Add about 1 in per step if the treads have a pronounced nosing and the runner will wrap over it.

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