Total flight measurement tips
Measure the total rise (from finished floor to finished floor) and total run (from base to top). This is more accurate than measuring individual treads if you're planning the entire flight's carpet length. Always factor in landing turns—if you have a winder or a landing, these sections need significant extra material for pattern matching.
| Measurement | Impact |
|---|---|
| Total Rise | Determines total riser count |
| Total Run | Determines tread coverage |
| Landing turns | Add at least 1 metre extra |
| Waste margin | Add 10% for cuts |
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 calculate total flight length?
Measure the horizontal run of the stairs and vertical rise, then apply the Pythagorean theorem.
Why is total flight length different from individual tread measurement?
It accounts for the cumulative effect of all treads and risers, plus landings.
What should I add for turns?
Usually at least 1 metre extra per landing or turn for safety and pattern alignment.
Does the calculator handle winder stairs?
It's best used for straight flights; for winder stairs, you need to account for the wider turn.
Should I include landings in total length?
Yes, landings are part of the runner pathway and need carpet.
Is a 10% waste margin enough?
Yes, usually 10% is standard for straight runs, but use 15-20% if you have complex turns.
What if my total length is over a roll size?
You'll need to join the runner, which requires careful planning for pattern matching.
How do I finish the runner at the base?
Use a clean cut or turn it under, leaving at least 30-50cm extra length.
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.
Get your custom runner dimensions 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.