Stair Calculator

Stair Calculator – Calculate the number of steps, riser height, tread depth, and stair angle for safe and ergonomic stair design.

Stair Calculator Stair Calculator

Basic Version
Comprehensive Version
🪜 Stair Calculation Results
  • 🔢 Steps:
  • 📏 Total Run: meters
  • 📐 Stair Length: meters
  • 📈 Mount Angle: °
  • 🦶 Tread Used: cm
  • 🚪 Headroom OK:
📊 Rise vs Run Chart
Other Calculators

Description

🪜 Stair Calculator – Design Safe & Accurate Staircases

The Stair Calculator helps you determine the rise, run, angle, and number of steps required to build a safe and functional staircase. It is widely used in construction, architecture, interior design, and DIY projects to ensure compliance with building codes and ergonomic comfort.

📘 What It Calculates:

  • ✅ Number of steps based on total height and riser height

  • ✅ Tread depth (run) for comfortable step placement

  • ✅ Stair angle or slope for safe design

  • ✅ Total stair length and stringer dimensions

💡 Features:

  • Supports both metric and imperial units

  • Helps avoid design errors in stair construction

  • Ensures stairs meet ergonomic and safety standards

  • Useful for homes, commercial buildings, and outdoor projects

👤 Who Should Use This:

  • 📌 Architects and civil engineers designing buildings

  • 📌 Contractors and carpenters building staircases

  • 📌 Interior designers planning layouts

  • 📌 Homeowners or DIY builders working on projects

✅ Pro Tip:

A standard comfortable stair design follows the “2R + T = 24–25 inches” rule, where R = riser height and T = tread depth.

🔗 Related Tools:

To accurately determine stair dimensions such as riser height, tread depth, and number of steps.

Too high makes stairs difficult to climb, while too low makes them uncomfortable and space-consuming.

Around 7–7.5 inches (18–19 cm).

Tread depth is the step’s horizontal part, ensuring enough space for foot placement and comfort.