Measuring runner for U-shaped stairs

A U-shaped or switchback stair doubles back on itself around a half landing, so the runner makes a 180° change of direction — with a piece layout that must be agreed with the installer.

Add the lower flight, the half landing and the upper flight, then apply your waste allowance to the combined total.

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.

Half landings are bigger than people expect

A half landing spans the width of both flights plus the gap between them, and the runner usually crosses it in an L or a straight run. Measure the actual runner path — 48 to 60 in is common.

Piece planning

The usual approach is three pieces: lower flight, landing, upper flight. Some fitters run the landing piece into one of the flights. Either way, plan the joins before ordering so the pattern lines up across them.

A worked U-shaped example

Eight steps up, a 54 in half landing, eight steps up again, 10 in tread and 7.5 in riser: (16 × 17.5) + 54 = 334 in. With 10% waste that is 367.4 in, or 30 ft 7 in.

Questions people ask

How many pieces of runner for a U-shaped staircase?: Usually three: one for each flight and one for the half landing. The 180° turn cannot be made in a single piece.
Should the landing pattern line up with the flights?: Ideally yes. Tell your supplier the pattern must match across joins and add 15% waste rather than 10%.

Related guides

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