Stair Calculator

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

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
How to Use

About the Stair Calculator

What it calculates

This stair calculator estimates material quantities and project costs for home improvement work. Calculate rise, run, and step count for stairs.

When to use it

Use before purchasing materials to reduce waste and budget more accurately for DIY or contractor projects.

Example

Adjust the inputs above to model your specific scenario with the Stair Calculator.

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