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Online gear calculator. 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

Herringbone Gear Calculator

Opposite-hand helixes meet at mid-face so axial thrust cancels. Same ISO 21771 inputs as helical, with 3D STEP/STL/GLB export.

Design a herringbone gearset

Rack & Pinion Calculator

Helical rack and pinion with matching ISO 53 tooth depth. Pitch-line space equals tooth thickness; length stays in sync with tooth count.

Design a rack and pinion

Design free — no credit card to start

Use the online calculator for spur, helical, herringbone, planetary, and rack-and-pinion 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, herringbone, planetary & rack

5 gear types in one browser: spur, helical, herringbone, planetary, and rack-and-pinion.

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.