Stair Runner Length CalculatorStair type
Stair runner length calculator for open riser stairs
With open risers there is nothing behind the tread, so the runner covers the tread and wraps around the front and often underneath the nosing — but it does not run down a riser face.
Set the riser height to zero and add a wrap allowance instead. The saving is significant: a 15 step flight drops from 262 in to about 180 in.
Stair runner calculator
Your stair runner length
20 ft 3.1 in
Total runner required for 13 steps, including a 10% waste allowance.
| 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 |
Recommended purchase length
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.
Your measurements, drawn to scale
Treads-only calculation
Length = steps × (tread depth + wrap). A typical wrap is 2 to 3 in to take the runner over the nosing and under the tread edge where it is stapled out of sight.
Cut pads are often better
On open risers, individual bound tread pads look cleaner than a continuous runner, because a continuous piece has nothing to sit against between treads. Count one pad per tread in the materials list.
Fixing without risers
Rods cannot be used the usual way with no riser to fix into. Most installers use adhesive, double-sided tape or hidden staples under the nosing.
Questions people ask
- Do open riser stairs need less runner?
- Yes, roughly 40% less, because only the tread depth plus a small wrap is covered rather than tread plus riser.
- Can I use stair rods on open risers?
- Usually not — there is no riser face to fix brackets into. Adhesive, tape or concealed staples are the normal alternatives.