How much runner do 20 steps need?

For 20 covered steps, the answer still depends on your tread depth and riser height. The figures below use equal steps with no landing or nosing allowance.

With a 10 in tread and a 7.5 in riser, 20 steps need 350 in — 29 ft 2 in, or 8.89 m — before any allowance.

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 20 step numbers at a glance

Bare length 350 in (29 ft 2 in). With 5% waste: 367.5 in (30 ft 7.5 in). With 10% waste: 385 in (32 ft 1 in). With a 36 in landing and 10% waste: 424.6 in (35 ft 4.6 in).

Metric equivalent

A 20 step flight with a 22.5 cm going and a 19 cm rise needs 8.30 m bare, about 9.13 m with 10% waste.

Where this step count shows up

20 steps usually means a tall single flight or a stair with a landing partway up, so check for a turn before you rely on one straight measurement.

Check before you order

Count the tread-and-riser sections the runner will actually cover, not the number someone quotes for the stair. If one step differs, switch on “Measure each step” in the calculator and enter it separately. Bullnose or curtail bottom steps need extra material your fitter should confirm.

Questions people ask

How much runner do I need for 20 stairs?: With 10 in treads and 7.5 in risers, 20 equal covered steps need 350 in (8.89 m). Adding 10% gives 385 in (9.78 m), before supplier rounding and with no landing or nosing allowance.
Does 20 steps mean 20 risers?: Not always. Check how many tread-and-riser sections are covered and whether the runner starts or stops partway through one. Allow for those ends separately.

Related guides

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