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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 ISO 21771 or AGMA 908 geometry and ISO 6336 / AGMA rating. Select ISO 53 hob Types A–D (or pregrind) for real trochoid roots — not a simplified fillet.

Design a spur gearset

Planetary Gear Calculator

Sun, planet, and ring in one layout — no 3-part CAD rebuild. Fixed or Auto Δz2 for equal-teeth or reduced-planet mesh with coaxial profile-shift balance, then rate with ISO 6336 or AGMA methods.

Design a planetary gear set

Helical Gear Calculator

Set helix angle β and export 3D STEP without rebuilding CAD. Same hob selection, geometry, and rating methods as spur, with transverse module.

Design a helical gearset

Herringbone Gear Calculator

Opposite-hand helixes meet at mid-face so axial thrust cancels. Same geometry and rating methods 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. Pick a hob profile, then perform rating calculations with ISO 6336 or AGMA methods in the Advanced Gear Data Report. Subscribe when you need full manufacturing data and DXF/SVG or STEP/STL/GLB export.

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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.

Geometry & rating

ISO 21771 / AGMA 908 geometry and ISO 6336 / AGMA 2001·2101 rating in one Advanced report.

Trochoid roots

Hobbed trochoid root in every DXF — not a simplified fillet. Apply a protuberance pregrind hob and finishin allowance.

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 planetary meshes with Fixed or Auto Δz2.

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, hob / basic rack, 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: Advanced reports with ISO/AGMA geometry and ISO 6336 / AGMA load-capacity rating, plus hob sketches, diameters, tooth thicknesses, 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.

Geometry and rating methods

Pick SI- or inch-aware methods in the Advanced Gear Data Report — same standards engineers already use for tooth geometry, hob basic racks, and load capacity.

Geometry

  • ISO 21771:2007

    Cylindrical gear geometry — module, profile shift, and working dimensions.

  • ISO 53 basic rack / hob

    Types A–D tip radius and clearance, plus protuberance pregrind with finishing stock.

  • AGMA 908-B89

    Geometry factors with AGMA 913-A98 tooth specification on the inch path.

Rating

  • ISO 6336-1/-2/-3:2019 Method B

    Contact and bending load capacity; allowables from ISO 6336-5.

  • ANSI/AGMA 2001-D04 · 2101-D04

    Inch (2001) or metric (2101) rating matched to your unit system.

Spur, helical, herringbone, and planetary Advanced reports. Rack focuses on geometry and export.

Start a gear design