How to Measure for a Stair Runner

How to Measure for a Stair Runner (Pro Installer’s Guide)

Hi, I’m Keith Shannon from DirectCarpet.com. I’ve personally installed over 1,000 stair runners across North America over the past 25 years. I’ve measured and installed on straight runs, boxed steps, landings, winders, and tricky turns. This guide shows my proven process to get a perfect fit the first time.

Quick Calculator (Inline)

Use the calculator right here, then keep scrolling for written steps and pro tips. For the full tool, open /pages/stair-runner-calculator in a new tab.

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Note: This quick estimator assumes a typical 18″ per step (tread + riser). Length is rounded up to the nearest foot. Add full landing lengths separately. For advanced cases (landings, turns, winders), use the full calculator.

What You’ll Need

  • 📏 Tape measure
  • ✏️ Pencil + notepad (or phone)
  • 📐 Optional: small square/ruler

Step‑by‑Step Measuring

  1. Choose your width. Most homes look best at 27–32 inches. Narrow stairs or tight spindles may require less; wide, grand stairs can take more.
  2. Count your steps. Include every tread and riser, plus any landings or winders.
  3. Measure one step run. Tread depth + riser height (include nosing). Take several measurements and use the largest.
  4. Include landings and turns. Measure each landing length and any turns.
  5. Add side reveals. Keep 3–5 inches visible on each side for balance.
  6. Calculate total length. (Tread + riser) × steps + landings + extra for finishing. (Or use the full calculator.)

Pro Tips from 25+ Years in the Field

  • ✅ Measure twice, cut once. Double‑check every measurement before ordering.
  • ✅ Allow extra length for all stair runners. This ensures proper fitting and adjustments.
  • ✅ Top riser finishing. Add 6–8 inches so your last step finishes cleanly.
  • ✅ Mind the spindles. Measure between them to ensure your chosen width fits comfortably.

Ready to Shop?

Find the perfect stair runner for your home:

FAQ

📏 What width should I choose?

In most homes, 27–32 inches looks balanced. Aim for a 3–5 inch reveal on each side and verify spindle/newel clearance. If you’re unsure, run the calculator with your measurements.

↩️ How do I measure landings and turns?

Measure the full landing length and include the next tread/riser sequence after each turn. For 90° turns, add the landing + the first step after the turn; for 180° returns, include both landings and the steps between.

🔍 What if my steps vary in size?

That’s common. Take measurements on a few different steps and use the largest tread+riser value so your runner never comes up short. We can also accommodate custom sizing—just mention your measurements when ordering and we’ll build it to fit.

Written by Keith Shannon — DirectCarpet.com | Updated August 9, 2025