basic

Gear Train Ratio, Output Torque & Speed Calculator

GR = N2/N1; T_out = T_in × GR × η — gear mechanics.

Calculates gear ratio, output shaft speed, and output torque for a simple gear pair from input conditions and gear tooth counts.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
Was this helpful?

How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

GR = N_driven/N_driver; N_out = N_in/GR; T_out = T_in×GR×η

In depth

Calculates gear ratio, output shaft speed, and output torque for a simple gear pair from input conditions and gear tooth counts.