Standard: Top platform is one step below the floor level.
Flush: Top platform is level with the floor.
Introducing the 3D Spiral Stair Calculator
This tool lets you see exactly how your spiral staircase will look in real time — while adjusting key values like height, radius, rotation, number of steps, and mounting option.
No technical skills needed. Just enter your measurements, and watch the model update instantly.
What You Can Adjust
You can change:
- Unit System: Choose between metric (centimetres) or imperial (inches)
- Stair Height — how high your stair goes from floor to top
- Radius — distance from centre to edge of the stair
- Rotation — how much the staircase turns over its full height (e.g., 360° means one complete turn)
- Number of Steps — total number of risers in the design
- Mount Option — whether your landing is “standard” (one step below) or “flush” ( level with floor)
As soon as you change any input, the model updates. You can rotate it by dragging — no need to click anywhere.
What You See
A clear 3D view of a spiral stair:
- Steps are shown in wood-like brown tones
- Central pole is black/dark grey
- Floor and walls are light grey (not distracting)
- Lighting shows shadows across the steps
You can see how the staircase curves as it goes up — with each step turning slightly.
The model isn’t flashy — just functional. Its goal is to help you visualize your design before building it.
How It Helps You
This tool gives you:
- Riser height — average height of each step (calculated from total rise and number of steps)
- Angle per step — how much the stair turns per step, based on rotation
For example:
- If your total rise is 260 cm, and you have 14 steps, then riser height = ~18.57 cm
- If rotation is 360° over 14 steps, then angle per step = ~25.7°
These numbers help you check if your design feels right — like a standard staircase or one that fits your space.
Why It’s Useful for You
You can:
- Try different values to see how changes affect the model
- Avoid common mistakes: e.g., making steps too high, or rotation too small
- Plan your project with confidence — no guesswork
The tool doesn’t just show a picture. It gives you real data that matters for construction.
Tips for Best Results
- Use accurate measurements — small changes can affect the angle and height significantly
- Try different rotations to see how much the stair turns
- Make sure your browser allows scripts and images (the 3D model loads from a CDN)
Final Thoughts
This tool is built for anyone who needs quick visual feedback on their spiral staircase. Whether you’re designing, building, or just curious — you can try it right now.
It works well on phones, tablets, and desktops — the layout adapts to small screens too.
Key Features
- Real-time updates as you type
- Clear visualisation of the spiral staircase
- Accurate values for riser height and angle per step
- Standard vs flush options — helps you understand where the landing is placed