Stair Carpet Calculator

Carpeting a staircase requires more material than most people expect — the Stair Carpet Calculator works out exactly how much carpet you need and what it will cost. Enter your tread depth, riser height, stair width, number of steps, and carpet price per m² to get the total carpet area, carpet length, cost estimate, and area per step. You can also toggle a 10% waste factor to cover cutting and installation offcuts.

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Horizontal depth of each step

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Vertical height of each step

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Width of the staircase

Recommended to account for cutting and installation waste

Results

Total Carpet Required

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Carpet Length

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Total Cost

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Area per Step

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Frequently Asked Questions

How do I calculate carpet for stair runner?

To calculate carpet for a stair runner, measure the tread depth and riser height of each step, then multiply by the number of steps. Add the stair width to get the total area. Don't forget to include a 10% waste factor for cutting and installation.

Where do I start my stair carpet installation?

Start carpet installation from the bottom of the stairs and work your way up. This ensures proper alignment and makes it easier to stretch and secure the carpet as you progress upward.

Are stairs expensive to carpet?

Stair carpeting costs vary depending on carpet quality, stair dimensions, and installation complexity. Generally, expect to pay more per square meter than flat floor carpeting due to the precision cutting and labor-intensive installation required.

What is the cost to carpet a 12-step stairs?

For a typical 12-step staircase (90cm wide), you'll need approximately 6-8 square meters of carpet. With mid-range carpet at £25/m², expect to pay £150-200 plus installation costs.

How much waste should I add when buying stair carpet?

Add 10-15% waste factor when purchasing stair carpet. This accounts for cutting errors, pattern matching, and having spare material for future repairs. Complex stair designs may require up to 20% extra.

What measurements do I need for stair carpet calculation?

You need three key measurements: tread depth (horizontal step surface), riser height (vertical step face), stair width, and total number of steps. Measure each dimension carefully as even small errors can lead to insufficient carpet.

Can I use regular carpet for stairs?

While you can use regular carpet for stairs, it's recommended to choose carpet specifically designed for high-traffic areas. Look for low pile, dense construction, and good backing to withstand the wear and tear of stair use.