Planetary Gearbox Calculator

Calculate planetary gear train ratios using Willis equation. Multi-stage analysis with speed, torque, and efficiency calculations.

Planetary Gearbox

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Formula

Planetary Gearbox — see inputs panel for active relations

This module is fully available. Detailed formula cards are filled in as each solver is polished; results still come from the module engine.

Project standards applySI units preferred

Assumptions & limits

  • Use for preliminary engineering checks
  • Confirm critical decisions against codes, catalogs, and mill data
  • Units and sign conventions must match the input labels
AluCalc 2026-07-12