Stair Calculator

How Does the Stair Calculator Work?

Our Stair Calculator helps you design and build safe, comfortable stairs for your home or project. Enter the total rise and run, select your preferred units, and optionally set your ideal riser height or tread depth. Instantly see the number of steps, riser height, tread depth, stringer length, and angle. This tool is perfect for homeowners, DIYers, and professionals planning a stairway. Enjoy a modern, mobile-friendly experience with clear instructions, helpful tips, and a detailed FAQ to answer all your questions.

Accurate stair calculation is essential for safety, comfort, and code compliance. Our calculator supports multiple units and custom preferences, making it easy to plan for any project. Use the tips below to ensure your stairs are safe and comfortable.

Parameters Explained

  • Total Rise: Enter the total vertical height from the lower floor to the upper floor (inches, cm, feet, or meters).
  • Total Run: Enter the total horizontal length of the stairway (inches, cm, feet, or meters).
  • Preferred Riser Height: Optionally set your ideal riser height (inches, cm, feet, or meters).
  • Preferred Tread Depth: Optionally set your ideal tread depth (inches, cm, feet, or meters).
  • Units: Choose your preferred units for each dimension.

FAQs

  • How do I calculate the number of steps?
    The calculator divides the total rise by your preferred riser height and rounds to the nearest whole number.
  • What is a typical riser height?
    Most stairs use a riser height of 7 inches (18 cm).
  • What is a typical tread depth?
    Most stairs use a tread depth of 10 inches (25 cm).
  • How do I find the stringer length?
    The calculator uses the Pythagorean theorem to find the diagonal length of the stair stringer.
  • What is the ideal stair angle?
    Most stairs have an angle between 30° and 37° for comfort and safety.
  • Can I change units?
    Yes, you can select inches, cm, feet, or meters for your project.
  • Does this include handrails or landings?
    No, calculate those separately if needed.
  • Can I copy the results?
    Yes, simply select and copy any result value.

Tips for Accurate Stair Calculation

- Double-check your measurements and units.
- Use a riser height and tread depth that meet local building codes.
- Add extra for overhangs or nosings if needed.
- Consult your supplier or builder for recommendations.

Use this calculator to plan, budget, and complete your stair project with confidence!

Stair Calculator