Understanding the quarter-turn
A quarter-turn staircase turns 90 degrees, often utilizing a small square landing or a set of pie-shaped winder steps to make the transition. This turn is where most measuring mistakes occur. The key is to remember that the runner doesn't turn perfectly square; it needs to be carefully measured along its travel path. If you are using winders, you must measure along the walk line, which is about two-thirds of the way out from the inside corner of each tread.
Measuring tips
If your quarter turn uses a flat landing, treat it as a separate floor area. Measure the full length and width, and ensure your runner is wide enough to cover that area comfortably. For winder stairs, you need to measure the going of each winder at the walk line and include that in your step count. It's often helpful to template the entire turn section on paper first to visualize how the runner will sit.
How much runner do I need?
Total your straight steps as standard, then add the landing area or winder path length. For a typical quarter-turn, adding 3 ft (0.9 m) is a good starting point, but always factor in extra for waste—aim for 10-15%. Using the stair runner calculator is the best way to get a precise estimate for your unique flight.
| Measurement | Imperial (in) | Metric (cm) |
|---|---|---|
| Straight step total | 200 in | 508 cm |
| Quarter turn allowance | 36 in | 92 cm |
| Waste (10%) | 24 in | 60 cm |
| Total runner needed | 260 in (21.7 ft) | 660 cm (6.6 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 calculatorWhen you are ready to buy your stair runner carpet, take your time. There are many beautiful stair runners on the market, and you want to ensure the one you choose can handle the stress of a turned staircase. Plan your purchase through the stair runner calculator to avoid any surprises.
- Measure around the curve, not square.
- For winders, measure at the walk line (2/3 out from the corner).
- Always template a winder turn if you are unsure.
- Add 10-15% for waste to cover pattern matching and cutting.
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 extra runner do I need for a quarter-turn?
Typically 3 feet (0.9 m) of extra length, but always check with the stair runner calculator.
Do winders need special fitting?
Yes, winders require individual attention and precise cutting to keep the runner centred.
Can I use a flat landing on a quarter-turn?
Yes, a quarter-landing makes fitting much easier as you can treat it like a mini floor area.
How do I ensure the pattern aligns?
This is very challenging on turns, which is why most people prefer solid or simple-textured runners for winders.
Is a quarter-turn staircase harder to fit?
Yes, it involves more complex geometry than a straight flight, especially on winder stairs.
What should I look for in a runner for a turn?
A runner that is flexible, durable, and not overly thick.
Should I template the turn?
If you have winders, templating is highly recommended for a professional result.
What is the biggest mistake with quarter-turn runners?
Underestimating the length needed or failing to account for the walk-line measurement on winders.
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.
Calculate your quarter-turn runnerEvery 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.