Tread and riser reference
| Dimension | US typical | UK typical | Building code min/max |
|---|---|---|---|
| Tread depth | 10-11 in | 23-28 cm | US: 10in min; UK: 220mm min |
| Riser height | 7-7.75 in | 17-20 cm | US: 7.75in max; UK: 220mm max |
| Nosing overhang | 0.75-1.25 in | 16-25 mm | US: 0.75in min |
Runner width chart
| Width (in) | Width (cm) | Tread width it suits |
|---|---|---|
| 22 in | 56 cm | 26-32 in |
| 27 in | 68 cm | 33-39 in |
| 32 in | 81 cm | 38-44 in |
| 36 in | 91 cm | 43-49 in |
Length per step reference
Multiply tread depth plus riser height to get length used per step, then multiply by step count and add waste allowance.
| Tread+riser combo | Per step | 13 steps raw | 13 steps + 8% waste |
|---|---|---|---|
| 10in tread + 7.5in riser | 17.5 in | 227.5 in (18.96 ft) | 245.7 in (20.5 ft) |
| 25cm tread + 19cm riser | 44 cm | 572 cm (5.72 m) | 618 cm (6.18 m) |
| 11in tread + 7in riser | 18 in | 234 in (19.5 ft) | 252.7 in (21.1 ft) |
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 calculatorMeasure your own stairs, do not assume standard sizes
These figures are typical, not universal. Older houses in particular deviate significantly from modern code minimums, so always measure your own flight.
Safety and building-code notes
Stairs are one of the most common places for a fall in the home, so anything touching stair runner measurement chart should be checked against basic safety practice as well as good looks. Codes vary by jurisdiction but the underlying principles are consistent everywhere carpet meets a staircase.
- Keep nosing build-up modest; a lip much over 3/8 in (10 mm) between the runner and a bare edge becomes a trip hazard.
- Use a slip-resistant backing or pad, particularly on the top and bottom steps where speed is highest.
- Secure every edge fully; a loose corner or lifted seam is the single most common cause of a stair fall on carpeted stairs.
- In rented or multi-occupancy buildings, check local fire and flooring regulations before installing natural fibre runners.
Tools and materials, with typical prices
Before starting anything connected to stair runner measurement chart, it helps to know what the job actually costs in tools and consumables, not just carpet. Most of this list is a one-off purchase that will be reused on future stair or rug projects, so it is worth buying reasonable quality rather than the cheapest option.
- Tape measure and chalk line: $15-30 (£12-24), for marking and checking dimensions.
- Utility knife and spare blades: $10-20 (£8-16), for clean cuts through backing.
- Staple gun or tackless strip and knee kicker: $40-150 (£30-120) depending on method.
- Underlay/pad, per step: $3-6 (£2.50-5), skip only where the fibre specifies no pad.
- Seam tape or adhesive for joins: $8-15 (£6-12) per roll or tube.
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
What is a standard stair tread depth?
9-11in (23-28cm) is typical, with US and UK building codes generally requiring a minimum around 10in (250mm) for new staircases.
What is a standard stair riser height?
7-8in (18-20cm) is typical for residential stairs, with most codes capping maximum riser height around 7.75in (200mm).
What runner width fits a 40 inch wide staircase?
32in (81cm) is the closest stock width, leaving about a 4in reveal on each side, which is a comfortable standard margin.
How do I use a stair measurement chart to order a runner?
Measure your own tread depth, riser height and tread width, match them to the closest chart values, then use the corresponding stock width and calculated length as your starting order specification.
What is the biggest mistake people make with this?
Rushing the measuring or prep stage. Most poor outcomes with stair runner measurement chart trace back to a single measurement taken at the wrong point, or a substrate check skipped to save a few minutes, both far cheaper to fix before the runner is cut than after.
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.
Use the full 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.