Start with your measurements
Before you look at a single colour swatch, measure your staircase. You need the tread depth (the horizontal part you step on), the riser height (the vertical part), the number of steps, and the overall stair width. If your staircase has winders or a landing partway up, measure those sections separately, since they often need more material than a straight run of the same length. A stair runner length calculator turns these raw numbers into a buyable length, including the extra needed to wrap around each nosing.
Working the numbers for a 13-step flight
Using US dimensions: 10 in tread + 7.5 in riser + 0.75 in nosing wrap = 18.25 in per step. Over 13 steps that totals 237.25 in. Add 24 in for tucking under the top landing and finishing at the bottom, giving 261.25 in, or 21.77 ft. With a 10% waste allowance for cutting and pattern matching, order around 24 ft. In metric: 25 cm + 19 cm + 1.9 cm = 45.9 cm per step, times 13 is 596.7 cm, plus 60 cm finishing is 656.7 cm, plus 10% waste brings you to about 7.3 m.
| Item | US (in/ft) | UK (cm/m) |
|---|---|---|
| Per-step total | 18.25 in | 45.9 cm |
| 13 steps subtotal | 237.25 in | 596.7 cm |
| Plus finishing | 261.25 in / 21.77 ft | 656.7 cm / 6.57 m |
| Plus 10% waste | ~24 ft | ~7.3 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 calculatorChoosing width and gap
Stair runners are sold in fixed widths, most commonly 27, 30, 32, or 36 in (roughly 69, 76, 81, or 91 cm). The runner should be narrower than your total stair width so you leave an even gap of exposed tread on each side, typically 2-4 in (5-10 cm). A wider gap suits a more traditional look, while a narrower or non-existent gap gives a more contemporary, wall-to-wall feel.
Material and construction
Wool and wool-blend runners are prized for their durability and natural look but sit at a higher price point. Nylon is the workhorse choice for busy households, standing up to heavy foot traffic and resisting stains when treated. Sisal and other plant fibres look striking but can be rougher underfoot and less forgiving of moisture. Match your fibre choice to your household's traffic level rather than purely to aesthetics.
Don't forget the underlay and rods
A stair runner's total cost includes the underlay beneath it and, if you want a traditional look, stair rods to hold it in place at each riser. Budget for these as separate line items rather than assuming they are bundled with the runner price.
- Measure treads, risers, winders, and total stair width before shopping.
- Add nosing wrap and finishing allowance, then a 10% waste margin.
- Choose a width that leaves an even gap on each side.
- Pick a fibre suited to your household's foot traffic.
- Budget separately for underlay and stair rods.
A worked cost example
To put real numbers on the process, take the same 13-step flight used throughout this guide, needing about 24 ft (7.3 m) of runner and a matching length of underlay. A budget nylon runner sits at the lower end of the price spectrum, a mid-range wool-blend sits in the middle, and a premium pure wool runner sits at the top. Underlay typically adds a modest amount on top of any of these, and labour, if you hire a fitter rather than doing it yourself, is usually priced separately again. Looking at all four line items together, rather than just the headline runner price, gives you a realistic total before you commit to an order.
| Fibre tier | Relative material cost | Typical lifespan |
|---|---|---|
| Budget nylon | Lowest | 5-8 years under normal use |
| Wool-nylon blend | Mid-range | 8-12 years |
| Premium wool | Highest | 12-20+ years with good care |
Spec checks before you click buy
Before finalising an order, run through a short spec checklist: confirm the roll width matches your planned runner width, check the pile height is suitable for stairs (generally under 0.5 in / 1.3 cm), verify the fibre content matches what is advertised, and check the return or exchange policy in case a sample colour looks different once the full roll arrives. Also confirm the lead time in writing, especially if you have a fitter booked for a specific date, since a delayed delivery is one of the most common causes of installation day headaches.
- Confirm roll width against your planned runner width before ordering.
- Check pile height is suitable for stairs, not just living-room use.
- Verify fibre content matches the product description exactly.
- Get the delivery lead time in writing if a fitter is already booked.
- Review the return policy before cutting or fitting any material.
Comparing suppliers
Prices and stock vary widely between big-box retailers, specialty carpet stores, and online-only runner brands. Big-box stores often have faster delivery and easier returns, while specialty retailers may carry a wider range of natural fibres and custom widths. Whichever you choose, always order samples first and confirm the lead time against your fitter's availability, since a delayed delivery can push back an entire installation schedule.
Buying a stair runner is ultimately a balance of measurement accuracy, material choice, and budget. Get your length calculated correctly, choose a fibre that suits your home, and you will end up with a runner that looks good and lasts.
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.
Frequently asked questions
How much stair runner should I buy for 13 steps?
Around 23-24 ft (7-7.3 m) for a standard flight, including nosing wrap, finishing allowance, and waste margin.
What width stair runner should I buy?
Choose a width that leaves an even 2-4 in (5-10 cm) gap of exposed tread on each side of your total stair width.
Is wool or nylon better to buy?
Wool offers a luxurious look and good durability at a higher price; nylon is more budget-friendly and highly resistant to wear.
Do I need to buy underlay separately?
Yes, underlay is almost always sold separately from the runner itself and is essential for durability and comfort.
Should I buy stair rods too?
Only if you want the traditional look and function they provide; many modern installations use tackless strips or adhesive instead.
Can I buy a stair runner without measuring first?
You can, but you risk ordering too little material, especially if your stairs have winders or an unusual landing.
Where is the best place to buy a stair runner?
Compare big-box retailers, specialty carpet shops, and online runner brands for price, stock, and lead times before deciding.
How much extra should I buy for waste?
A 10% margin is standard to cover cutting, pattern matching, and minor measuring errors.
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.
Check your exact length 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.