# Gear Ratio Calculator

> Calculate gear ratio from driver and driven gear teeth counts. Returns gear ratio, output RPM at a given input RPM, and an ideal output torque estimate given an input torque.

**URL:** https://www.calculatoranswers.com/gear-ratio-calculator
**Category:** Education

## Quick Answer

Determine the gear ratio between two gears based on their teeth count, and calculate output RPM and torque.

## Definition

A gear ratio calculator is a mechanical engineering tool used to compute the rotational relationship between two or more intermeshing gears. By dividing the number of teeth on the driven gear by the number of teeth on the driver gear, the calculator determines the mechanical advantage and rotational speed ratio. It can also estimate the output speed in rotations per minute (RPM) and the output torque based on input specifications. Automotive mechanics and robotics engineers use this tool to design drive systems, optimize gearboxes, and configure vehicle differentials.

## How to Use

1. **Enter Gear Teeth Counts** — Input the number of teeth on the driving gear and the driven gear.
2. **Input Speed and Torque** — Specify the input rotational speed in RPM and the input torque value.
3. **Calculate Outputs** — Review the resulting gear ratio, output RPM, and estimated output torque.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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