Free Gear Pitch Calculator | Module, Diametral & Circular Pitch Conversion

Master gear tooth pitch calculations. Gear pitch defines the fundamental scale of gear teeth and determines whether two gears can mesh. Use GearDXF to convert seamlessly between Metric Module (m), Imperial Diametral Pitch (DP), and Circular Pitch (p), calculate pitch diameters, and generate exact CAD DXF files.

Key Features

• Instant bidirectional conversion between Module, Diametral Pitch, and Circular Pitch
• Calculates Pitch Diameter, Base Diameter, Addendum, Dedendum, and Whole Depth
• Verifies meshing compatibility across different tooth sizes
• Interactive 2D visualization of the active pitch circle and working depth
• Exports production-ready DXF, SVG, and 1:1 scale printable PDF files
• 100% free with no limits on tooth count or scale

Frequently Asked Questions

What is the relationship between Module and Diametral Pitch (DP)?

Module and Diametral Pitch are inversely related through the constant 25.4 (inches to mm): Module = 25.4 / DP, and DP = 25.4 / Module.

What is Circular Pitch (p)?

Circular pitch is the physical distance measured along the pitch circle from a point on one tooth to the corresponding point on the next: p = π × Module = π / DP.

Can a Metric Module gear mesh with an Imperial Diametral Pitch gear?

No. Gears must have the exact same pitch to mesh without interference. While Module 2 (12.7 DP) is close to 12 DP or 13 DP, small pitch errors accumulate rapidly and cause catastrophic jamming.