Optimizing the position
Ideally, the rod should sit snug into the corner of the tread and riser. This minimizes carpet wear at that high-tension area and keeps the runner firmly in place as you walk up and down.
How much runner do I need?
As before, for a 13-step flight (10 in / 25 cm treads, 7.5 in / 19 cm risers), you need 23.5 ft (7.09 m) of runner. Proper rod placement helps maximize the durability of this investment.
| Measurement | US (in/ft) | UK (cm/m) |
|---|---|---|
| Tread run | 10 in | 25 cm |
| Riser height | 7.5 in | 19 cm |
| Per-step total | 18.25 in | 45.9 cm |
| Total (13 steps) | 19.77 ft | 5.97 m |
| With 8% waste | 23.5 ft | 7.09 m |
Know your numbers in 30 seconds
Enter your step count, tread depth and riser height — the stair runner calculator gives you the exact length to order, in metres and feet, with waste included.
Open the stair runner calculatorInstallation tip
Ensure the bracket is fixed to the tread, not the riser, for the strongest support.
- Fit rods into the corner
- Use tread-mounted brackets
- Maintain consistency across all steps
- Keep tension uniform
Whatever you decide, get the numbers first: the stair runner calculator doubles as a stair runner length calculator, adding nosing wrap, landings, winders, pattern repeat and waste so you order the right length the first time.
Still deciding on material, width or pattern? Our hub on stair runners compares weaves, widths, backings and fitting styles side by side, then hands the numbers straight to the calculator.
Frequently asked questions
Should the rod touch the riser?
Yes, it should be positioned neatly into the corner to hold the runner fold firmly.
Is the riser height important?
Yes, it dictates the angle at which the rod and bracket sit.
Can I adjust the spacing?
You want the rod to sit in the corner; spacing is generally fixed by the corner geometry.
Do brackets differ for height?
Brackets are designed for a standard corner fitment.
What if my tread has a nosing overhang?
You may need special brackets designed to sit correctly under a protruding stair nosing.
How tight should the rod be?
It should hold the runner firmly against the stair without being overly compressed.
Can incorrect spacing look bad?
Yes, it can cause the carpet to gap at the corner.
Is this spacing consistent for every step?
Yes, on a straight staircase, the spacing should be uniform for the best appearance.
Know your numbers in 30 seconds
Enter your step count, tread depth and riser height — the stair runner calculator gives you the exact length to order, in metres and feet, with waste included.
Plan your staircase geometry with our calculatorEvery guide is written from hands-on measuring and fitting experience, checked against the calculator’s own maths, and re-reviewed whenever prices or methods change. Read our editorial standards.