Construction

Stair Carpet Calculator

Estimate carpet or runner length for stairs.

Number of steps

Rise per step

Tread depth

Stair width

Calculated Output

Carpet length 2.167

Carpet area 2.167

Formula: length = steps × (rise + tread) ÷ 12

Step-by-Step Breakdown

1. Values used:

2. Number of steps = 13

3. Rise per step = 1

4. Tread depth = 1

5. Stair width = 1

7. Carpet length = 2.167

8. Carpet area = 2.167

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The math behind it

length = steps × (rise + tread) ÷ 12; × width for area. Add ~1 ft for each wrap-around.

13 steps, 7" rise, 11" tread × 3 ft → 19.5 ft (~58.5 ft²).

Wrap-around?

Add extra length if the carpet wraps over the nose.