Why riser count matters
The riser count is the total number of risers between floor levels. It's often the 'gotcha' measurement—some people measure the number of treads, forgetting that the top step is flush with the upper floor. Always count the risers for a true step count. When fitting a runner, each riser needs covering, so getting this number perfect is essential for ordering your carpet length.
| Measurement | Standard |
|---|---|
| Riser Height | 150-200mm |
| Ideal Count | 13-14 for standard houses |
| Total Rise | Floor to floor distance |
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 calculatorWhatever 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 do I count risers correctly?
Count every vertical face from the bottom floor to the top landing.
Is the top step a riser?
Yes, the top step riser is the vertical face that meets the top floor landing.
Why count risers instead of treads?
Risers are always the definitive number of vertical steps in a flight.
Does count affect runner length?
Absolutely—every extra riser adds about 20cm of runner.
Can I have an odd number of risers?
Yes, the count simply matches the vertical distance between floors.
What's a standard riser height?
Usually around 170mm to 190mm.
Do I need a calculator for this?
It's simple math, but the calculator ensures you include the top riser, which is easily missed.
How do I calculate if riser heights are uneven?
Divide the total rise by the riser count to check for uniformity.
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 runner length with our stair runner 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.