Stair Calculator | EZ Virtual Tools Construction

Stair Dimensions

Total Rise (inches)

Available Run (inches)

Stair Width (inches)

Building Code

Stair Materials Calculator

Number of Risers

Stair Width (inches)

Tread Depth (inches)

Stringer Material

Number of Stringers

Tread Material

Deck Stair Calculator

Deck Height (inches)

Stair Width (inches)

Target Rise (inches)

Target Run (inches)

Stair Specifications

Dimensions

0
Risers

0
Treads

Rise Height

Run Depth

Total Run

0°

Stair Angle

Stringer Length

Min Headroom

Code Compliance

Code requirements (IRC):
Rise: 7-3/4" max | Run: 10" min | Nosing: 3/4" - 1-1/4"
Width: 36" min | Headroom: 80" min
Handrail: 34" - 38" height | Max variation: 3/8"

Stair Formulas

Rule of thumb formulas:
Rise + Run = 17" to 18" (comfort rule)
2×Rise + Run = 24" to 25" (safety rule)
Rise × Run = 70 to 75 sq in (efficiency rule)

Stringer calculation:
Length = √(Total Rise² + Total Run²)