Mechanical Engineering

Gear Ratio Calculator

GR = N_driven/N_driver. Output speed and torque calculations

Last reviewed: How we build & verify
teeth
teeth
RPM
N·m

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Frequently Asked Questions

Gear Ratio Calculator runs right in the browser tab you already have open. No install, no account, no cost.

Gear Ratio Calculator follows the standard method used in textbooks and technical references for this calculation, and we show the formula or approach on the page itself so you can check the working rather than trust a black box. Found an edge case that breaks it? Use the feedback button in the bottom-right corner.

Gear Ratio Calculator | ExaCalc