Stair Tread Calculator

Calculate stair tread and riser quantities, nosing linear footage, material area, and installation cost by material type.

Inputs

Number of Steps

Stair Width

Tread Depth

Riser Height

Material

Tab to move between fields

Results

Treads Needed

Total Material

56.88 sq ft

≈ 85 sheets of paper

Installation Cost

$1,300.00

≈ 10 pairs of sneakers

Risers Needed13

Nosing39 LF

How to Use This Calculator

Enter the number of steps in the staircase.
Input the stair width in inches (code minimum is typically 36 inches).
Enter the tread depth and riser height in inches.
Select the material: hardwood, carpet, vinyl/LVP, or tile.
Review the total tread board-feet, riser material needed, and estimated cost.

How the result changes with Number of Steps

Number of Steps	Treads Needed	Total Material	Installation Cost
5.9	5.9	25.81 sq ft	$590.00
18	18	78.75 sq ft	$1,800.00
33	33	144.38 sq ft	$3,300.00
45	45	196.88 sq ft	$4,500.00

What each input means

Number of Steps: Total number of steps (typical residential flight is 13-14).
Stair Width: Width of the staircase (code minimum is typically 36").
Tread Depth: Depth of each tread from front to back (code minimum ~10").
Riser Height: Height of each riser (code maximum typically 7.75").
Material: Material type affects cost and installation method.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Number of Steps = 13, Stair Width = 36, Tread Depth = 10, Riser Height = 7.5 = 5 input(s) provided
Calculate Treads Needed
Treads Needed
13 = 13
Calculate Total Material
Total Material
56.88 = 56.88
Calculate Installation Cost
Installation Cost
1300 = $1,300
Calculate Risers Needed
Risers Needed
13 = 13
Calculate Nosing
Nosing
39 = 39

Engine last updated July 28, 2026.

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