How much runner do I need for this job?
Before you tackle any care task, it helps to know how much material you are actually working with. For a standard 13-step flight with 10 in (25 cm) treads, 7.5 in (19 cm) risers, and a 0.75 in (1.9 cm) nosing wrap, each step consumes 18.25 in (45.9 cm) of runner. Multiplied across 13 steps that is 19.77 ft (5.97 m), and once you add the 24 in (60 cm) finishing allowance at top and bottom you reach 21.77 ft (6.57 m). A 10% waste margin for cutting and pattern matching brings the total order to roughly 24 ft (7.3 m).
These numbers matter for maintenance too: knowing the exact yardage helps you order matching offcuts for repairs, budget for cleaning by the linear foot or metre, and plan any partial replacement without guesswork. The stair runner length calculator handles all of this automatically once you enter your own tread, riser, and step count, so you are never left estimating on a ladder with a tape measure.
| Measurement | US (in/ft) | UK (cm/m) |
|---|---|---|
| Tread depth | 10 in | 25 cm |
| Riser height | 7.5 in | 19 cm |
| Nosing wrap | 0.75 in | 1.9 cm |
| Total per step | 18.25 in | 45.9 cm |
| 13 steps subtotal | 19.77 ft | 5.97 m |
| Plus allowances | 21.77 ft | 6.57 m |
| With 10% waste | 24 ft | 7.22 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 calculatorVisual signs it is time for a new runner
The most obvious sign is exposed backing or visible weave where the pile has worn away completely, typically on the nosing of the most heavily used steps. Once the backing shows through, no amount of cleaning or pile-lifting will restore the carpet, since the actual fibre material is gone rather than just compressed. Widespread, permanent glazing or shine across multiple steps, where the pile has been crushed so consistently that it reflects light differently than the surrounding carpet, is another strong signal, especially if steam-and-lift attempts have failed to restore any texture.
Fraying, unravelling, and loose edges
Bindings that have started to fray, pull away, or unravel at the edges are both a cosmetic and a functional problem, since a loose edge can catch a foot and cause a fall. Small fraying spots can sometimes be re-stitched by a professional, but if fraying appears in multiple locations along the flight, it usually indicates the binding thread has simply reached the end of its service life throughout, making a full replacement more sensible than repeated patch repairs.
Safety-related signs that should not be ignored
Any rippling, buckling, or looseness underfoot is a genuine safety hazard on a staircase and should prompt immediate action, whether that is re-stretching the existing runner or planning a replacement. Similarly, if the pile has become so matted and glazed that it feels slick rather than textured underfoot, particularly in socks, this loss of grip increases slip risk and is a legitimate reason to replace even if the runner still looks reasonably presentable from a distance. Persistent odours that survive multiple professional cleans, often from pet accidents that have penetrated the underlay or subfloor, are another practical reason to start fresh rather than continue treating a problem that keeps recurring.
Weighing repair against replacement
Before committing to a full replacement, honestly assess whether the damage is localized or widespread. A single dented step from furniture, a small moth-damaged patch, or an isolated stain are all good candidates for the repair techniques covered in our pile crush repair and moth prevention guides. But once damage spans multiple steps, involves the backing rather than just the pile, or the runner is simply nearing the end of its expected 10-15 year lifespan for a quality wool product (or 7-10 years for a well-made synthetic), replacement becomes the more cost-effective long-term choice, since continued patchwork repairs on an ageing runner rarely deliver a result that matches the look and safety of new material.
| Sign | Repair possible? | Recommended action |
|---|---|---|
| Exposed backing on nosing | No | Replace affected run |
| Isolated dent or crush | Yes | Steam-and-lift or ice-cube method |
| Fraying at multiple points | Limited | Replace if widespread |
| Persistent odour after cleaning | Rarely | Replace runner and check underlay |
| Rippling or looseness underfoot | Sometimes | Re-stretch or replace |
Measure before you decide
Even if you are only replacing part of a run, use the stair runner calculator to check current pricing per foot or metre against your existing installation cost. Sometimes a full replacement across the whole flight, rather than a visually mismatched partial repair, ends up being the smarter long-term choice.
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
How long should a stair runner last before replacement?
A quality wool runner typically lasts 10-15 years with good care, while a well-made synthetic runner often lasts 7-10 years under similar conditions.
Is exposed backing always a replacement situation?
Yes, once the pile is worn through to the backing, the fibre itself cannot be restored, so replacement of that section is necessary.
Can I replace just the worn bottom steps?
It is possible if the runner was installed in separate sections, but on a continuous piece it usually leads to a visible mismatch, so a full-flight replacement is often preferred.
Does a lingering pet odour always mean I need a new runner?
Not always; try professional cleaning and an enzyme-based odour treatment first, but if the smell persists it has likely penetrated the underlay or subfloor.
Is rippling dangerous enough to warrant immediate action?
Yes, any looseness or rippling underfoot on stairs is a genuine trip hazard and should be addressed promptly, either by re-stretching or replacing.
Will a new underlay extend a worn runner’s life?
New underlay helps going forward but cannot reverse existing pile or backing damage on the runner itself.
Should I match my new runner to the old one exactly?
Not necessarily; replacement is a good opportunity to reconsider colour, pattern, or fibre choice based on lessons learned from the old runner’s performance.
How do I budget for a full replacement?
Use the stair runner calculator to get an accurate length, then multiply by your chosen material’s price per foot or metre, adding installation labour if you are not fitting it yourself.
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 runner with the stair runner 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.