GearGen.XYZ
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Skip the CAD gear sketch. Export DXF, STEP, and STL from your browser

Spur Gear Calculator

Build a 2D DXF and 3D CAD model with gear geometry based on ISO 21771. All gears are generated from the hob and have a trochoid root — not a simplified fillet.

Design a spur gearset

Planetary Gear Calculator

Sun, planet, and ring ratio in one layout — no 3-part CAD rebuild. Try different planet counts and see mesh before you model.

Design a planetary gear set

Helical Gear Calculator

Set helix angle β and export 3D STEP without rebuilding CAD. Same profile-shift and backlash controls as spur, with transverse module.

Design a helical gearset

Design free — no credit card to start

Design, visualize, and validate spur, helical, and planetary geartrains in your browser. Gear geometry is based on ISO 21771. Subscribe when you need full manufacturing data and DXF/SVG or STEP/STL/GLB export.

Gear DesignReverse Engineering3D PrintingCNC MachiningRoboticsEngineeringEducationLaser CuttingPrototype Parts

Why choose GearGen.xyz

Speed

First spur pair in 5 minutes, not an hour in CAD.

CAD Export

Export 5 formats: DXF, SVG, STEP, STL, GLB.

Gear dimensions

One live report: diameters, tooth thickness, span, and center distance.

Trochoid roots

Hobbed trochoid root in every DXF — not a simplified fillet. Geometry based on ISO 21771 with ISO 53-style hob roots.

Precise tooth control

Dial in backlash and tooth thickness together — same controls on spur and helical, with transverse module.

Profile Shift

Prevent undercutting, adjust center distance and balance strength.

Span inspection

Verify a gear from span measurement in under 5 minutes.

Share & embed

Share a live embed link — no CAD install.

Spur, helical & planetary

3 gear types in one browser: spur, helical, planetary. Sun, planet, and ring ratio without rebuilding CAD.

Time comparisons based on typical manual CAD, spreadsheet, and handbook workflows.

Functional Gear Design, Made Intuitive

Everything you need to move from a blank canvas to production-ready geometry, directly in your browser.

Phase 1

Design

  • The Fundamentals: Define your gear geometry with total control over module, pressure angle, profile shift, and backlash.
  • Custom Layouts: Build complex geartrains and planetary systems using an intuitive X,Y coordinate grid and angular positioning.
  • Reverse Engineering: Input known measurements to solve for missing parameters and recreate obsolete parts with ease.

Phase 2

Validate

  • Visualize: Animation controls with interactive play, pause, and reverse to visualize mesh interference and verify rotation.
  • Gear Data Reports: Access gear data blocks including diameters, tooth thicknesses, tolerances, and inspection measurements.
  • Part Numbers: Assign part numbers and custom descriptions to every gear in your gearset to stay organized.

Phase 3

Execute

  • Save: Save geartrains online and reopen the same assembly from any device without rebuilding your layouts.
  • Shareable Links: Generate shareable links to send your gear data for collaboration or create an iframe to embed in your website.
  • CAD Export: Export optimized DXF and SVG files plus STEP, STL, and GLB models to import into your CAD, CAM, and 3D printing workflows — start building your parts today.