How to Use the Calculator

The interface has two parts: a sidebar on the left with all parameters, and a 3D viewport on the right showing your staircase in real time. Every change you make updates the model instantly.

1. Choose Your Stair Shape

At the top of the sidebar, select the stair shape:

• Straight — single flight, no turns
• L-Shaped — 90° turn (winder steps or landing)
• U-Shaped — 180° turn (winder steps or landing)
• Double Turn (U-2L) — two 90° turns with a middle flight

Metal frame and floating glass calculators are on separate pages with their own controls.

2. Set Main Dimensions

The most important parameters:

• Floor-to-floor height — total height from finished floor to finished floor above (mm)
• Number of steps — affects rise height (shown below the slider)
• Tread depth — horizontal depth of each step (mm)
• Stair width — overall width of the staircase (mm)

The calculator shows rise height and stride length (2R+G) in real time below the sliders. A comfortable stride length is typically 600–650 mm.

3. Turn Settings (L / U / U-2L)

For stairs with turns, you can configure:

• Turn left / right — direction of the turn
• Turn type — 3 winder steps or a landing platform
• Steps before turn — how many steps in the first flight

For U-2L (double turn), each turn can be configured independently, and you set the number of steps between turns.

4. Railing

Set the railing position for each flight: inside, outside, both, or none. Choose from several baluster types:

• Square, Square fluted, Cylinder (wood/steel/black)
• English style, Forged, Glass panels

5. Materials & Finish

Choose a material preset (one material for everything, two-tone, or fully custom per component). Available wood types: pine, oak, oak (clean), veneer, plywood. Apply finishes: natural, stains (walnut, wenge, dark walnut, Brenner), or enamels (white, ivory, terracotta, pistachio, graphite).

6. 3D Viewport

The 3D model updates automatically. Controls:

• Left mouse button — rotate
• Scroll wheel — zoom
• Right mouse button — pan
• Dimensions button (top right) — toggle 3D dimension lines

7. 2D Top View

Switch to "2D Top" using the buttons above the sidebar. This shows a plan view with dimension annotations. You can zoom and pan the 2D view the same way.

8. Export (coming soon for wood)

For metal frame and floating glass calculators, GLB 3D model export is already available — use it in Blender, SketchUp, or any 3D software. PDF blueprints and DXF files for CNC manufacturing are on the roadmap for wooden stairs.

Tip: The calculator is a design tool, not a replacement for professional verification. Always double-check critical dimensions before ordering materials or starting construction.

Open Calculators