Free Gear Generator — Spur Gear Calculator & Builder | DXF & SVG Export
Gear Generator: The best free, browser-based gear generator tool used by engineers and makers to design custom involute spur gears. Export directly to DXF or SVG files for CAD, CNC, and laser cutting. Unlike older gear generators, our tool provides native SVG and DXF exports with clean closed-loop paths, requires absolutely no installation or flash plugins, and is 100% free with no ads or paywalls. This free online gear generator uses the standard involute curve equation to calculate precision tooth profiles, ensuring smooth meshing and efficient power transmission.
How to Design Custom Gears
Adjust parameters such as the number of teeth, module (or diametral pitch), pressure angle, and mounting hole diameter using the sidebar controls. The real-time preview matches your exact specifications, ensuring what you see is what you get. Design individual gears or complex multi-gear sets with multiple axles.
DXF & SVG Export for CAD/CAM
Download your designs in industry-standard formats. Use DXF export for compatibility with AutoCAD, SolidWorks, and Fusion 360. Use SVG export for vector graphic editors like Inkscape and Adobe Illustrator. Both formats produce clean, closed-loop paths optimized for CNC machining, laser cutting, and waterjet cutting.
Precision Involute Gear Profiles
This generator calculates tooth geometry using the standard involute curve equation. Supports standard pressure angles (14.5°, 20°, 25°) and custom values. The resulting profiles ensure smooth meshing for real-world mechanical applications.
Spur Gear Calculator — Calculate Spur Gears Online
Use this gear generator as a full spur gear calculator. Enter the number of teeth and module to instantly calculate pitch diameter, addendum, dedendum, and outside diameter. The gear calculator handles both metric (module) and imperial (diametral pitch) units so you can calculate spur gears in whichever system your workshop uses.
Gear Ratio Calculator
Designing a gear train? The built-in gear ratio calculator determines the ratio between meshing gears automatically. Add a driving gear and a driven gear, and the gear generator shows the resulting speed ratio and direction of rotation. Perfect for gearbox design, speed reduction, and torque multiplication.
Gear Builder — Visual Design Interface
The gear builder interface lets you visually create multi-gear assemblies by adding gears to axles, positioning them with click-and-drag, and connecting parent-child gear relationships. Think of it as a modern, browser-based alternative to tools like GearSketch — but with DXF and SVG export built in.
Gear Simulator — Test Before You Cut
The gear simulator animates your entire gear assembly in real time. Adjust RPM, reverse direction, and watch every gear in the set rotate together. The simulator verifies that tooth profiles mesh correctly and gear ratios match your design intent — all before you send files to a laser cutter or CNC machine.
Perfect For
- Laser Cutting: Clean, closed-loop gear paths ready for your laser cutter.
- CNC Machining: Precision DXF files for CNC routers and mills.
- 3D Printing: Export profiles to extrude in your 3D modeling software.
- Woodworking: Print gear templates for scroll saw or band saw cutting.
- Robotics: Design custom gearboxes and transmission systems.
- Education: Use the gear calculator and gear simulator for teaching mechanical engineering and gear theory.
No signup required. No cloud processing. All gear geometry is calculated locally in your browser for maximum privacy and speed. 100% free with no ads or paywalls. A modern alternative to GearSketch and legacy gear generators.