Rod length by runner width
| Runner width | Typical rod length | Overhang each side |
|---|---|---|
| 24 in | 28 in | 2 in |
| 27 in | 31 in | 2 in |
| 30 in | 34 in | 2 in |
| 32 in | 36 in | 2 in |
| 36 in | 40 in | 2 in |
Rods sit outside the runner, not on it
The brackets need to land clear of the runner edge, so a rod is normally about 4 inches longer than the runner overall. Some ranges are supplied over-long and cut to size.
Diameters and where they suit
| Diameter | Look | Best for |
|---|---|---|
| 9–10 mm | Slim, modern | Narrow runners, minimal interiors |
| 12–13 mm | Standard | Most homes, most widths |
| 16 mm | Substantial | Wide runners, period staircases |
| 19 mm+ | Statement | Grand staircases, tall ceilings |
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 calculatorHow many rods do you need?
One rod per step, sitting in the crotch where the tread meets the riser. Many people omit the bottom step for a cleaner line at floor level, so a 13-step flight typically takes 12 or 13 rods, plus two brackets and two finials each.
| Steps | Rods | Brackets | Finials |
|---|---|---|---|
| 10 | 10 | 20 | 20 |
| 13 | 13 | 26 | 26 |
| 16 | 16 | 32 | 32 |
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 length stair rods do I need for a 27in runner?
Around 31 inches, allowing roughly 2 inches of rod beyond each edge of the runner for the brackets.
How many stair rods per step?
One rod per step, seated in the angle between tread and riser. Some people skip the bottom step for a cleaner finish.
What diameter stair rod is standard?
12 to 13mm suits most homes. Go to 16mm or above on wide runners and grand period staircases.
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.
Size my stair rods