Stair Calculator

Calculate rise, run, and step count for safe and comfortable stairs.

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Total Height
Total vertical height from lower floor to upper floor.
Targets
Ideal step height (Std: 7.5'')
Ideal step depth (Std: 10'')
Calculated Plan

0

steps

Required Steps

0.000"

Exact Riser Height

0 ft

Total Run Length

Stair Profile
0.0010
0 Steps • 0.0° Slope

Stringer Details

0ft
Min Board Length

Usually requires 2 ft boards (allowing for cuts).

Specifications

Number of Treads0
Total Rise0.0"
Stringer Throat~10" (2x12)
Documentation

How It Works

We divide the total rise by your target riser height to find the optimal number of steps, then recalculate exact dimensions.

Steps = Round(Total Rise / Target Rise)

Actual Rise = Total Rise / Steps

Run = (Steps - 1) × Tread Depth

Building Codes (Typical)

  • Max Riser: 7.75 inches (IBC)
  • Min Tread: 10 inches
  • Max Slope: ~37-42 degrees
  • Consistency: Variation < 3/8 inch
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