Typical length by step count
| Number of steps | Raw length (10 in tread / 7.5 in riser) | With 10% waste allowance |
|---|---|---|
| 10 | 175 in / 4.44 m | 192.5 in / 4.89 m |
| 12 | 210 in / 5.33 m | 231 in / 5.87 m |
| 13 | 227.5 in / 5.78 m | 250.3 in / 6.36 m |
| 14 | 245 in / 6.22 m | 269.5 in / 6.85 m |
| 16 | 280 in / 7.11 m | 308 in / 7.82 m |
| 18 | 315 in / 8 m | 346.5 in / 8.8 m |
The math behind the numbers
Each step adds one tread depth plus one riser height to the total length, since the runner follows the tread surface then wraps down the riser face before starting the next tread. A standard tread depth of 10 in (25 cm) plus a standard riser height of 7.5 in (19 cm) gives 17.5 in (44 cm) per step, which is then multiplied by the number of steps and topped up with a waste allowance.
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 calculatorWhy standard dimensions vary
| Stair type | Typical tread depth | Typical riser height |
|---|---|---|
| Standard US residential | 10-11 in (25-28 cm) | 7-7.75 in (18-20 cm) |
| Standard UK residential | 9.5-10.5 in (24-27 cm) | 7-7.9 in (18-20 cm) |
| Steep or older builds | 8-9 in (20-23 cm) | 8-8.25 in (20-21 cm) |
| Shallow, wide staircases | 11-12 in (28-30 cm) | 6.5-7 in (16.5-18 cm) |
Feet and metres at a glance
- A 12-step flight typically needs about 17.5-19 ft (5.3-5.9 m) including waste.
- A 13-step flight typically needs about 19-21 ft (5.8-6.4 m) including waste.
- A 16-step flight typically needs about 23-26 ft (7-7.8 m) including waste.
- Add 3-5 ft (0.9-1.5 m) more for a flight with a landing or 90-degree turn.
Why a rule of thumb is not enough to order from
Two staircases with the same step count can differ in total length by a foot or more depending on tread depth and riser height, which are rarely identical between homes, especially older builds. Use a stair runner length calculator with your own measured dimensions rather than a generic average when you are ready to order material, since ordering short means a visible seam or a delayed second order.
| Step count | Length range across different tread/riser combos |
|---|---|
| 13 steps | 18.5-21.5 ft (5.6-6.5 m) |
| 16 steps | 22.5-26.5 ft (6.9-8.1 m) |
Landings and turns add length beyond the simple formula
A half landing typically adds 3-6 ft (0.9-1.8 m) depending on its depth, and this is on top of the straight-flight calculation, not included in it.
Ordering guidance
- Count your steps and measure tread depth and riser height at two or three points.
- Multiply per-step total by step count for raw length.
- Add 8-12% waste for a straight flight, more for turns or patterned repeats.
- Confirm the final cut length with your supplier before approving the order.
How runner length compares across common home layouts
| Home layout | Typical step count | Typical runner length |
|---|---|---|
| Single-storey bungalow with porch steps only | 3-6 | 5-9 ft (1.5-2.7 m) |
| Standard two-storey home, single flight | 12-14 | 18-21 ft (5.5-6.4 m) |
| Two-storey home with a half landing | 12-14 plus landing | 22-26 ft (6.7-7.9 m) |
| Three-storey townhouse, two flights | 24-28 total | 36-44 ft (11-13.4 m) |
Why length estimates matter for budgeting early
Even before you commission a full measurement, a rough length figure lets you sanity-check quotes and compare suppliers pricing per linear foot or metre. If one quote implies a materially shorter length than these typical ranges for your step count, ask what tread and riser dimensions they assumed, since an unusually short estimate is often based on a generic average rather than your actual stairs.
Accounting for the top and bottom finish
A waterfall finish at the top, where the runner is simply cut and turned under, uses slightly less material than a Hollywood finish that wraps and pins around the top nosing. Similarly, a runner tucked and fixed at the bottom step uses a little more than one that ends flush with the floor. These finishing choices typically add or save only an inch or two (2-5 cm) in total, but they are worth mentioning to your supplier alongside the core measurements.
Round up, never down
When in doubt between two close length calculations, always order the longer figure. A few extra inches of material cost far less than a rushed reorder and a delayed installation date.
How landings and turns change total length
A straight flight of 13 steps at roughly 7 in (18 cm) rise and 10 in (25 cm) run comes to about 17.5-19 in (44-48 cm) per step, giving a base length of roughly 19-21 ft (5.8-6.4 m) before waste. Add a half landing and a second flight, and total length can easily double, since each flight is measured and allowanced separately even though they may be described together as one staircase in casual conversation.
| Staircase configuration | Typical total runner length needed |
|---|---|
| Single straight flight, 12-14 steps | 18-22 ft (5.5-6.7 m) |
| Straight flight plus half landing turn | 24-32 ft (7.3-9.75 m) |
| Two full flights with landing | 35-45 ft (10.7-13.7 m) |
Why suppliers sell by the running yard or metre
Stair runner material is manufactured and sold as continuous rolls, so pricing and ordering by the linear yard or metre, rather than a fixed pre-cut length, lets a supplier cut exactly what any individual staircase needs. This is different from a rug or hallway runner, which is sold in fixed pre-made lengths, and is worth explaining to anyone confused about why stair runner listings show a price per yard or metre rather than a single flat price.
Cross-checking length against your budget per step
Once you know the approximate total length, dividing your material budget by that figure gives a realistic price-per-foot or per-metre ceiling to shop within, which is often more useful than comparing suppliers by their advertised per-unit price alone, since underlay, waste allowance and fitting are usually quoted separately and can shift the effective cost per step considerably.
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
How long is a stair runner for a 13-step staircase?
Typically 18.5-21.5 ft (5.6-6.5 m) including a waste allowance, based on standard tread and riser dimensions; exact length depends on your measured step size.
Do all staircases use the same tread and riser size?
No, dimensions vary by build era and country, typically 9.5-12 in (24-30 cm) tread depth and 6.5-8.25 in (16.5-21 cm) riser height, so measuring your own stairs is essential.
How much extra length should I add for waste?
8-12% for a straight flight with a plain material or repeat, rising to 12-18% for a flight with a landing or turn.
Does a runner with a landing need much more length?
Yes, typically 3-6 ft (0.9-1.8 m) more than the same step count without a landing, depending on the landing's depth.
Can I estimate length just by counting steps?
Only roughly. A stair runner calculator using your actual tread depth and riser height gives a far more reliable figure than counting steps alone.
What is a good average length to budget for planning purposes?
For early budgeting before final measurement, 1.5 ft (0.46 m) per step including waste is a reasonable planning average for standard residential stairs.
Does the finishing method at the top and bottom change the length needed?
Only slightly, typically 1-2 in (2-5 cm) either way, but it is worth confirming with your supplier since it can matter on a tight length estimate.
How much runner does a three-storey townhouse typically need?
Around 36-44 ft (11-13.4 m) total across two flights, though exact length depends on step count, landing depth and tread/riser dimensions in each flight.
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.
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Every 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.