Stair design
made magical.
Design straight, L-shaped, ladder and porch staircases online. Precise calculations, real-time 3D preview, and professional drawings ready for export — PDF, DXF, SVG, STEP, STL.
Pick your stair type.
Each calculator is tuned to its geometry. No generic forms — just the inputs your stair actually needs.
Straight staircase
Single straight flight — the most common run. Calculate rise, tread, total run, and angle in seconds.
Open calculatorL-shaped staircase
90° turn with a landing or winder steps. Layout-aware — fits stairs into corners and tight floor plans.
Open calculatorLadder staircase
Compact space-saver ladder. Steeper angle, ideal for lofts, mezzanines, and tight spaces.
Open calculatorPorch staircase
Outdoor entry stair for porches, decks, terraces, and gardens. Weather-friendly tread sizing and exposed-fastener detailing.
Open calculatorProfessional tools, zero setup.
Built for DIY homeowners and professionals alike. Same calculator, same precision — different export needs.
Precise calculations
All dimensions per common building codes. Rise ratio, step formula, and angle determined instantly as you type.
Real-time 3D preview
Side, top, and 3D views update live. Spot problems before you cut a single board.
Pro export formats
PDF construction plans, DXF + SVG for CAD/CNC, STEP for parametric CAD, STL for 3D printing.
Code-aware geometry
Per-type rules: ladder pitch limits, L-shape landing dimensions, porch outdoor sizing.
No signup to try
Use every calculator without an account. Pay only when you export — from €1 per download.
Browser-based
Nothing to install, nothing to update. Works on any modern browser, on any device.
Five formats, one calculator.
From quick PDF plans to production-ready CAD and 3D-print meshes. Every download includes the underlying calculation summary.
Construction plans
Multi-sheet A3 drawing — plan, elevations, stringers, treads, hardware. Print at scale, hand to your fabricator.
CAD / CNC ready
Layered DXF zip for AutoCAD, Fusion 360, and CNC routers. Stringers, treads, newels, and dimensions on separate layers.
Vector drawings
Scalable SVG zip — plan, elevation, and parts. Open in any browser or vector editor. Ideal for layout work and laser cutting.
Parametric 3D CAD
STEP geometry for SolidWorks, Fusion 360, Inventor. All bodies separated. Business plan only.
3D printable mesh
Watertight STL ready for slicers, 3D viewers, rendering. Single solid model. Business plan only.
Questions, mostly already answered.
Is Magic Stairs really free to use?
Yes. All four calculators — Straight, L-shaped, Ladder, and Porch — work without an account or payment. You only pay when you actually download an export — from €1 per file (PDF €1, DXF/SVG €3, Bundle €5, STEP/STL on Business plan).
Do I need to install anything?
No. Magic Stairs runs entirely in your browser. It works on Chrome, Firefox, Safari, and Edge, on desktop, tablet, and modern phones.
Which stair types do you support?
Four: Straight (single flight), L-shaped (90° turn with landing or winders), Ladder (compact / space-saver), and Porch (outdoor entry steps). U-shaped and Spiral are in development. We focus on doing each type well rather than supporting every variation.
How accurate are the calculations?
The math is engineering-grade and follows common building-code formulas (rise ratio, step formula, total run, angle). For projects that require permits, always have a local professional sign off — codes vary by region.
What export formats do you offer?
Five: PDF (multi-sheet construction drawing), DXF (CAD / CNC layered outlines), SVG (scalable vector for layout and laser cutting), STEP (parametric 3D CAD for SolidWorks / Fusion / Inventor), and STL (3D-printable mesh). STEP and STL are included only on the Business plan.
Ready to design your
dream staircase?
Start with any calculator — no account needed. Save your projects with a free account, or pay from €1 per download.