The challenge of winders
On winder treads, the width of the carpet can change at every step. Consequently, the length of the rod will also vary. You must measure every single step's rod requirement carefully to ensure a perfect fit for each one.
How much runner do I need?
Even with winders, the basic calculation (13 steps, 10 in / 25 cm treads, 7.5 in / 19 cm risers) suggests 23.5 ft (7.09 m) of runner, though you should always allow a little extra for tricky angles.
| Measurement | US (in/ft) | UK (cm/m) |
|---|---|---|
| Tread run | 10 in | 25 cm |
| Riser height | 7.5 in | 19 cm |
| Per-step total | 18.25 in | 45.9 cm |
| Total (13 steps) | 19.77 ft | 5.97 m |
| With 8% waste | 23.5 ft | 7.09 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 calculatorPro tip
Create a template for each winder step to ensure your rod measurements are perfectly accurate.
- Measure every tread individually
- Allow for extra length on wider steps
- Use templates for precision
- Professional fitting recommended
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
Is it harder to fit rods on winders?
Yes, it requires more patience and precision to get each rod perfectly aligned.
Do I need more rods for winder stairs?
You need one rod per step, the same as a straight staircase.
Can I use standard rods?
You will need rods that can be cut to the exact lengths required for each unique step.
Are winder brackets different?
Sometimes you need specific bracket configurations to accommodate the angles of the tread.
What if I get the measurement wrong?
A rod that is too short will look unbalanced; always measure thrice.
Can I fit them myself?
It is a challenging DIY task; many homeowners choose to hire a professional for winder staircases.
What about the runner for winders?
Winder runners are often custom-made or require specialized cutting and piecing.
Are rods necessary for winders?
They are optional but recommended for both security and the aesthetic they provide.
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 winder staircase project with our 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.