Stair Carpet Calculator
Estimate the amount of carpet needed for a set of stairs, including runners or full coverage, based on the dimensions of the steps.
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How to Measure for Stair Carpet
Carpeting stairs can enhance safety, reduce noise, and add a touch of comfort and style to your home. However, measuring for stair carpet is different from measuring a flat room. Our Stair Carpet Calculator is designed to help you accurately determine the amount of carpet you need, whether you're installing a full-width carpet or a stylish runner.
Understanding Stair Terminology
- Tread: The horizontal part of the step that you walk on.
- Riser: The vertical part of the step.
- Nosing: The edge of the tread that protrudes over the riser. Most stairs have this, and it must be accounted for.
- Stair Width: The measurement of the stair from one side to the other.
- Runner: A strip of carpet that doesn't cover the full width of the stair, leaving some of the wood visible on either side.
How to Measure Your Stairs
- Count the Stairs: Count the total number of steps you plan to carpet.
- Measure a Single Step: Use a flexible measuring tape. Start at the bottom of a riser, run the tape up the riser, across the tread, and wrap it over the nosing to where it meets the next riser. This gives you the most accurate "Length per Step" measurement.
- Measure the Width: Measure the width of your stairs. If you want a runner, decide how much wood you want exposed on each side and subtract that from the total width. For example, for a 36-inch wide stair with 3 inches of wood showing on each side, you would need a 30-inch wide runner.
- Measure Landings: If you have a landing, measure its length and width separately.
Frequently Asked Questions (FAQ)
- What if my stairs have winders or turn?
- For stairs with turning steps (winders), the calculation is more complex. Each winder is a different shape. You should measure the longest point of each winder's tread and riser and add them together. It's highly recommended to consult a professional installer for complex staircases.
- What is the difference between "waterfall" and "Hollywood" installation?
- In a "waterfall" installation, the carpet flows straight down from the nosing to the next tread. In a "Hollywood" (or upholstered) installation, the carpet is wrapped tightly around the nosing and tacked under it, providing a more tailored look. The Hollywood method requires slightly more carpet and labor.
- Why do I need a waste factor?
- A waste factor is crucial, especially for patterned carpets. You need extra material to ensure the pattern aligns correctly from one step to the next, which often results in discarded pieces. Even with plain carpet, extra material is needed for cuts and to have a spare piece for future repairs.
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