Free Metric Module Gear Calculator | ISO Standard Gear Dimensions
The international standard for gear design is the Metric Module system. In the module system, tooth size is directly proportional to the module (m = Pitch Diameter / Teeth). GearDXF calculates standard ISO metric gear geometry, generates exact involute contours, and exports production DXF files.
Key Features
- Standard metric module sizing from small precision gears (m0.5) to heavy power (m10+)
- Computes ISO standard Addendum (ha = 1.0m) and Dedendum (hf = 1.25m)
- Root fillet curvature modeling to eliminate stress concentration
- Interactive 2D animator showing metric gear meshing in real time
- Download DXF, SVG, and 1:1 scale PDF files ready for CNC milling and 3D printing
- Completely free with no software installation required
Frequently Asked Questions
What are the standard ISO metric gear modules?
Standard preferred modules (ISO 54) include: 0.5, 0.8, 1.0, 1.25, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, and 10.0.
How do I calculate pitch diameter from module?
Pitch Diameter (D) is simply: D = Module × Number of Teeth. For example, a Module 3 gear with 30 teeth has a pitch diameter of 90mm.
What is the outer diameter (tip diameter) of a metric spur gear?
Outer Diameter (Da) = Module × (Number of Teeth + 2). A Module 3 gear with 30 teeth has an outer diameter of 3 × (30 + 2) = 96mm.